Document and Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Amendment Description Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Condensed Consolidated Balance Sheets Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of the period Cash and cash equivalents at beginning of the period Cash and cash equivalents Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Restricted Cash and Cash Equivalents, Noncurrent Restricted cash Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and stockholders' equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued expenses Accounts Payable and Accrued Liabilities, Current Accounts payable and accrued expenses Deferred Revenue, Current Current portion of deferred revenue Deferred Rent Credit, Current Current portion of deferred rent Convertible Notes Payable, Current Convertible notes, net of discount Represents the carrying value, as of the balance sheet date, of repurchase liability for unvested equity awards, which is expected to be paid within one year (or the operating cycle, if longer). Repurchase Liability for Unvested Equity Awards Current Repurchase liability for unvested equity awards Warrants and Rights Outstanding Preferred stock warrant liability Long-term Debt, Current Maturities Current portion of long-term debt, net Long-term debt, current portion Liabilities, Current Total current liabilities Deferred Rent Credit, Noncurrent Deferred rent Accounts Payable and Accrued Liabilities, Noncurrent Accrued expenses Represents the carrying value as of the balance sheet date of exchangeable share liability, which is expected to be paid after one year (or the normal operating cycle, if longer). Exchangeable Share Liability Non current Exchangeable share liability Long-term Debt, Excluding Current Maturities Long-term debt, net of current portion Long-term debt, less current portion Convertible Notes Payable, Noncurrent Long-term convertible notes Outstanding debt Commitments and Contingencies Commitments and contingencies (Note 4) Temporary Equity, Carrying Amount, Attributable to Parent Convertible preferred stock, $0.001 par value; authorized shares - 68,360,186 at September 30, 2013 and 62,200,000 at December 31, 2012; issued and outstanding shares - 44,967,690 at September 30, 2013 and December 31, 2012; liquidation preference of $58,518 at September 30, 2013 and December 31, 2012 Stockholders' Equity Attributable to Parent [Abstract] Stockholders' deficit: Preferred Stock, Value, Issued Preferred stock, $0.001 par value; authorized shares-5,000,000 at June 30, 2014 and December 31, 2013; no shares issued or outstanding Common Stock, Value, Issued Common stock, $0.001 par value; authorized shares - 150,000,000 at June 30, 2014 and December 31, 2013; issued and outstanding shares - 20,561,477 at June 30, 2014 and 20,434,080 at December 31, 2013 Additional Paid in Capital Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Stockholders' Equity Attributable to Parent Total stockholders' equity Liabilities and Equity Total liabilities and stockholder's equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value (in dollars per share) Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred stock authorized (in shares) Preferred Stock, Shares Issued Preferred stock, issued shares Preferred Stock, Shares Outstanding Preferred stock, outstanding shares Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock, Shares Authorized Common stock, authorized shares Common stock authorized (in shares) Common Stock, Shares, Issued Common stock, issued shares Common Stock, Shares, Outstanding Common stock, outstanding shares Temporary Equity, Par or Stated Value Per Share Convertible preferred stock, par value (in dollars per share) Temporary Equity, Shares Authorized Convertible preferred, shares authorized Temporary Equity, Shares Issued Convertible preferred stock, shares issued Temporary Equity, Shares Outstanding Convertible preferred stock, shares outstanding Temporary Equity, Liquidation Preference Convertible preferred stock, aggregate liquidation preference (in dollars) Condensed Consolidated Statements of Operations and Comprehensive Loss Revenues [Abstract] Revenues: Contracts Revenue Collaboration revenue Revenue from Grants Grant revenue Revenue, Net Total revenue Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development Research and development expense General and Administrative Expense General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Loss from operations Nonoperating Income (Expense) [Abstract] Other income (expense): Investment Income, Interest Interest income Interest Expense Interest expense Investment Tax Credit Income from 48D tax credit Gains (Losses) on Extinguishment of Debt Loss on extinguishment of debt Loss on extinguishment of debt Represents the change in fair value amounts of exchangeable shares during the period. Fair Value Adjustment of Exchangeable Shares Change in fair value of exchangeable shares Fair value adjustment charge on the exchangeable shares Fair Value Adjustment of Warrants Change in fair value of warrant liability Change in fair value of preferred stock warrants Other Nonoperating Income (Expense) Total other expense, net Net Income (Loss) Attributable to Parent Net loss Net loss and comprehensive loss Earnings Per Share, Basic and Diluted Net loss per common share, basic and diluted (in dollars per share) Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted-average common shares used to compute basic and diluted net loss per share (in shares) Condensed Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating activities Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Issuance of Stock and Warrants for Services or Claims Issuances of common stock for technology Share-based Compensation Stock-based compensation Amortization of Debt Discount (Premium) Amortization of discounts Paid-in-Kind Interest Noncash interest expense Straight Line Rent Deferred rent Recognition of Deferred Revenue Deferred revenue Represents the initial fair value and change in fair value amounts of exchangeable shares during the period. Initial Fair Value and Adjustment of Exchangeable Shares Stock-based milestone charges and change in fair value of exchangeable shares Gain (Loss) on Disposition of Assets Loss on disposal of assets Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Accounts Payable and Accrued Liabilities Accounts payable and accrued expenses Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Investing activities Payments to Acquire Property, Plant, and Equipment Purchase of property and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from sale of property and equipment Increase (Decrease) in Restricted Cash Restricted cash Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Financing activities Proceeds from Issuance of Common Stock Issuance of common stock, net of repurchases and issuance costs Proceeds from (Repurchase of) Equity Issuance of common stock, net of repurchases Payments of Stock Issuance Costs Costs paid in connection with initial public offering Payments for Repurchase of Common Stock Proceeds from convertible promissory notes Net Proceeds from Issuance Initial Public Offering Net Proceeds from Issuance Initial Public Offering Net proceeds from initial public offering Proceeds from (cost of) initial public offering, net of offering costs Proceeds from Convertible Debt Issuance of convertible promissory notes Proceeds from Issuance of Long-term Debt Proceeds from long-term debt Net Proceeds after repayment of loans outstanding and transaction fees Repayments of Long-term Debt Payments on long-term debt Proceeds from Issuance of Convertible Preferred Stock Issuance of convertible preferred stock, net of offering costs Proceeds from Issuance of Preferred Stock and Preference Stock Issuance of preferred stock for cash, net of offering costs Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash (used in) provided by financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net change in cash and cash equivalents Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information Interest Paid Interest paid Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental schedule of noncash investing and financing activities Debt Conversion, Converted Instrument, Amount Conversion of notes payable for Series B preferred stock Represents warrants issued in connection with long-term debt during the period. Issuance of Warrants in Connection with Long Term Debt Issuance of warrants in connection with long-term debt Debt Instrument, Convertible, Beneficial Conversion Feature Beneficial conversion feature related to convertible notes Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of convertible preferred stock into common stock Represents equity impact of the value of conversion of convertible notes into common stock during the period. Stock Issued During Period Value Conversion of Convertible Notes into Common Stock Conversion of convertible notes into common stock Represents equity impact of the value of exchange of exchangeable shares into common stock during the period. Stock Issued During Period Value Exchange of Exchangeable Shares into Common Stock Exchange of exchangeable shares into common stock Represents amount of increase (decrease) in warrant liability which is reclassified to additional paid in capital (APIC). Adjustments to Additional Paid in Capital Reclassification of Warrant Liability Warrant liability reclassification to equity Organization and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Organization and Summary of Significant Accounting Policies Asset Acquisition of Verio Therapeutics Inc. The entire disclosure for an asset acquisition completed during the period, including background, timing, and recognized assets and liabilities. Asset Acquisition [Text Block] Asset Acquisition of Verio Therapeutics Inc. Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value Measurements Long-Term Debt, Commitments and Contingencies Long-term Debt [Text Block] Long-Term Debt, Commitments and Contingencies Stockholders' Equity Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Stockholders' Equity Subsequent Events Subsequent Events [Text Block] Subsequent Events Disclosure of accounting policy for initial public offering. Initial Public Offering Policy [Text Block] Initial Public Offering Use of Estimates, Policy [Policy Text Block] Use of Estimates Consolidation, Policy [Policy Text Block] Principles of Consolidation Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Revenue Recognition, Policy [Policy Text Block] Revenue Recognition Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Stock-Based Compensation Earnings Per Share, Policy [Policy Text Block] Net Loss Per Common Share New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Accounting policy relating to other assets which can consist of the Company's deferred IPO costs. Other Assets Policy [Policy Text Block] Other Assets Fair Value of Financial Instruments, Policy [Policy Text Block] Preferred Stock Warrant Liability Segment Reporting, Policy [Policy Text Block] Segment Reporting Fair Value Measurement, Policy [Policy Text Block] Fair Value of Financial Instruments Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration of Credit Risk Property, Plant and Equipment, Policy [Policy Text Block] Property and Equipment Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Impairment of Long-Lived Assets Deferred Charges, Policy [Policy Text Block] Deferred Rent Research and Development Expense, Policy [Policy Text Block] Research and Development Costs Disclosure of accounting policy for patent costs. Patent Costs Policy [Text Block] Patent Costs Income Tax, Policy [Policy Text Block] Income Taxes Comprehensive Income, Policy [Policy Text Block] Comprehensive Loss Liquidity Disclosure [Policy Text Block] Liquidity Tabular disclosure of changes in the number of shares of the entity's common stock issuable upon the exchange of the exchangeable shares and the initial fair value of the shares. Schedule of Changes in Shares Issued upon Exchange of Exchangeable Shares and Initial Fair Value [Table Text Block] Asset Acquisition of Verio Therapeutics Inc. Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Summary of the purchase price of the asset acquisition Schedule of Long-term Debt Instruments [Table Text Block] Schedule of long-term debt and unamortized discount balances (excluding convertible debt) Tabular disclosure of the issuances of shares. Schedule of Share Issuances [Table Text Block} Summary of share issuances Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for all long-term borrowings and operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. Schedule of Future Minimum Payments for Long Term Debt and Operating Leases [Table Text Block] Schedule of future minimum payments under the long-term debt and the non-cancelable operating lease Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Represents information pertaining to 2007 Equity Incentive Plan and 2013 Stock Option and Incentive Plan. Stock Option And Incentive Plan2007 And2013 [Member] Stock Option And Incentive Plan2007 And2013 [Member] Award Type [Axis] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Award Date [Axis] Award Date [Domain] Award Date [Domain] Employee Stock Option [Member] Employee Stock Option [Member] Represents an arrangement whereby a non-employee is entitled to receive in the future, subject to vesting and other restrictions, certain number of shares in the entity at a specified price, as defined in the agreement. Non Employee Stock Option [Member] Non Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stockholders' Equity Stockholders' deficit Schedule of Stock Options Roll Forward [Table Text Block] Summary of stock option activity under the Plan Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of allocation of stock-based compensation for all options and restricted stock awards Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of weighted-average assumptions used to determine the fair value of stock option grants Temporary Equity [Table Text Block] Schedule of the authorized, issued and outstanding shares of convertible preferred stock by series Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block] Summary of information about the Company's stock option activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Summary of outstanding restricted stock awards under the plan Tabular disclosure of the common stock reserved for future issuance. Schedule of Common Stock Reserved for Future Issuance [Table Text Block] Schedule of common stock reserved for future issuance Represents the number of platforms that optimize the activity and enhance the therapeutic potential of adult stem cells. Number of Platforms to Enhance Therapeutic Potential of Adult Stem Cells Number of platforms Initial Public Offering [Abstract] Initial Public Offering Stock Issued During Period, Shares, New Issues Shares sold in initial public offering Share Price Public offering price (in dollars per share) Proceeds from Issuance Initial Public Offering Gross proceeds from initial public offering Convertible Preferred Stock, Shares Issued upon Conversion Conversion convertible preferred stock into common stock Debt Conversion, Original Debt, Amount Principal amount of convertible debt converted Represents number of shares issued during the period as a result of the exchange of exchangeable shares into common stock. Stock Issued During Period Shares Conversion of Convertible Notes into Common Stock Number of shares of common stock issued upon conversion of debt Debt Instrument, Unamortized Discount Write-off of unamortized debt discount Repayments of Convertible Debt Repayment of outstanding principal and unpaid accrued interest in cash Represents the number of common stocks issuable on the redemption of exchangeable shares during the period. Common Stock Issuable upon Redemption of Exchangeable Shares Common stock issuable upon redemption of exchangeable shares Common stock issued pursuant to the redemption of the exchangeable shares Represents the number of shares of subsidiaries of the entity for redemption of exchangeable shares. Exchangeable Shares of Subsidiary for Redemption Exchangeable shares of Fate Canada for redemption Represents the warrant issued to purchase shares of convertible preferred stock, converted into new warrants to purchase common stock. Class of Warrant or Right Warrants Issued to Purchase Shares of Convertible Preferred Stock Converted Warrants to purchase shares of convertible preferred stock which are converted Represents the number of common stocks into which the class of warrant or right may be converted. Class of Warrant or Right Warrants Issued to Purchase Shares of Common Stock on Conversion Warrants to purchase shares of common stock issued on conversion Segment Reporting [Abstract] Segment Reporting Number of Operating Segments Number of operating segments Liquidity [Abstract] Liquidity Stockholders' Equity Note [Abstract] Reverse stock split Stockholders' Equity Note, Stock Split, Conversion Ratio Reverse stock split ratio Revenue Recognition [Abstract] Revenue Recognition, Milestone Method, Factors Four criteria needed for Company to recognize revenue Represents the shares excluded from the weighted-average number of shares outstanding attributable to share based payment arrangements including shares which have been issued upon the early exercise of stock options and are subject to future vesting and unvested restricted stock. Shares Attributable to Share Based Payment Arrangements Excluded from Weighted Average Number of Shares Outstanding Shares excluded from weighted average number of shares attributable to share based payments Weighted Average Number Diluted Shares Outstanding Adjustment Potentially dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Options to purchase shares of common stock included in potentially dilutive securities (in shares) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities Name [Domain] Antidilutive Securities Name [Domain] Convertible Preferred Stock [Member] Convertible Preferred Stock [Member] Warrant [Member] Warrant [Member] Represents information pertaining to the warrants for convertible preferred stock. Warrants For Convertible Preferred Stock [Member] Warrants For Convertible Preferred Stock [Member] Represents information pertaining to the warrants for common stock. Warrants For Common Stock [Member] Warrants For Common Stock [Member] Equity Unit Purchase Agreements [Member] Equity Unit Purchase Agreements [Member] Stock Compensation Plan [Member] Stock Compensation Plan [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Net loss per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti-dilutive securities (in shares) Convertible Notes Payable Outstanding principal under convertible promissory notes (in dollars) Outstanding debt Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition Acquiree [Domain] Business Acquisition Acquiree [Domain] Represents information pertaining to Verio Therapeutics Inc. Verio Therapeutics Inc [Member] Verio Therapeutics Inc [Member] Business Combination, Separately Recognized Transactions [Axis] Business Combination Separately Recognized Transactions [Domain] Business Combination Separately Recognized Transactions [Domain] Represents the period of April 2010 where the number of shares of the entity's common stock issuable upon the exchange of the exchangeable shares and the initial fair value are disclosed. Period Of April2010 [Member] Period Of April2010 [Member] Represents the period of March 2011 where the number of shares of the entity's common stock issuable upon the exchange of the exchangeable shares and the initial fair value are disclosed. Period Of March2011 [Member] Period Of March2011 [Member] Represents the period of May 2011 where the number of shares of the entity's common stock issuable upon the exchange of the exchangeable shares and the initial fair value are disclosed. Period Of May2011 [Member] Period Of May2011 [Member] Represents the period of April 2012 where the number of shares of the entity's common stock issuable upon the exchange of the exchangeable shares and the initial fair value are disclosed. Period Of April2012 [Member] Period Of April2012 [Member] Represents the period of July 2013 where the number of shares of the entity's common stock issuable upon the exchange of the exchangeable shares and the initial fair value are disclosed. Period Of July2013 [Member] Period Of July2013 [Member] Represents the period of March 2014 where the number of shares of the entity's common stock issuable upon the exchange of the exchangeable shares and the initial fair value are disclosed. Period Of March2014 [Member] Period Of March2014 [Member] Range [Axis] Range [Member] Range [Member] Maximum [Member] Maximum [Member] Business Acquisition [Line Items] Acquisition Number of shares of exchangeable stock issued during the period pursuant to acquisitions. Exchangeable Stock Issued during Period Shares Acquisitions Common Stock issued Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Shares issuable on exchange of Common Stock Represents the number of common shares that were deemed earned but not issued by the entity. Deemed Earned Common Stock Yet to be Issued Deemed earned common stock yet to be issued (in shares) Represents the amount of potential future increase in number of shares of the entity's common stock to be issued upon achievement of additional milestones. Business Acquisition Equity Interests Potential Increase in Number of Shares Achievement of Additional Milestones Potential increase in shares issuable on exchange of Exchangeable Shares based on achievement of additional milestones Represents the amount of potential future increase in number of shares of the entity's common stock to be issued upon achievement of certain preclinical milestones. Business Acquisition Equity Interests Potential Increase in Number of Shares Achievement of Certain Preclinical Milestones Potential increase in shares issuable on exchange of Exchangeable Shares based on achievement of certain preclinical milestones Represents the amount of potential future increase in number of shares of the entity's common stock to be issued upon achievement of certain clinical milestones. Business Acquisition Equity Interests Potential Increase in Number of Shares Achievement of Certain Clinical Milestones Potential increase in shares issuable on exchange of Exchangeable Shares based on achievement of certain clinical milestones Represents the amount of potential future increase in number of shares of the entity's common stock to be issued upon achievement of certain commercialization milestones. Business Acquisition Equity Interests Potential Increase in Number of Shares Achievement of Certain Commercialization Milestones Potential increase in shares issuable on exchange of Exchangeable Shares based on achievement of certain commercialization milestone Represents the fair value per share of underlying common stock in a business acquisition. Business Acquisition Fair Value of Underlying Common Stock Fair value per share of underlying common stock (in dollars per share) Represents the initial fair value amount of exchangeable shares (in dollars). Business Acquisition Initial Fair Value of Exchangeable Shares Initial Fair Value of Common Stock (in dollars) Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Net liabilities Business Combination, Consideration Transferred Total purchase price Represents reclassification of the exchangeable share liability into additional paid-in capital. Adjustment to Additional Paid in Capital Reclassification of Exchangeable Shares Reclassification of the exchangeable share liability to additional paid-in capital Represents the shares outstanding, as a condition for automatic redemption and exchange of shares in a business acquisition. Business Acquisition Shares Outstanding for Automatic Redemption and Exchange of Shares Shares outstanding for automatic redemption and exchange of shares Represents number of set of activities and assets of Business. Number of Assets and Set of Activities Number of set of activities and assets of Business Represents number of set of activities used to create outputs, to be considered a business. Number of Set of Activities to Create Outputs to be Considered Business Number of set of activities used to create outputs, to be considered a business Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Basis [Axis] Fair Value Disclosure Item Amounts [Domain] Fair Value Disclosure Item Amounts [Domain] Carrying Reported Amount Fair Value Disclosure [Member] Carrying Reported Amount Fair Value Disclosure [Member] Measurement Frequency [Axis] Fair Value Measurement Frequency [Domain] Fair Value Measurement Frequency [Domain] Fair Value Measurements Recurring [Member] Fair Value Measurements Recurring [Member] Fair Value Measurements Nonrecurring [Member] Fair Value Measurements Nonrecurring [Member] Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Measurements Fair Value Hierarchy [Domain] Estimate Of Fair Value Fair Value Disclosure [Member] Estimate Of Fair Value Fair Value Disclosure [Member] Fair Value Inputs Level1 [Member] Fair Value Inputs Level1 [Member] Fair Value Inputs Level3 [Member] Fair Value Inputs Level3 [Member] Fair Value Inputs Level2 [Member] Fair Value Inputs Level2 [Member] Liability Class [Axis] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation By Liability Class [Domain] Represents information pertaining to the preferred stock warrant liability amount. Preferred Stock Warrant Liability [Member] Preferred Stock Warrant Liability [Member] Represents information pertaining to exchangeable shares liability amount. Exchangeable Share Liability [Member] Exchangeable Share Liability [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair value measurements Cash and Cash Equivalents, Fair Value Disclosure Cash equivalents Assets, Fair Value Disclosure, Nonrecurring Non-financial assets Nonfinancial Liabilities Fair Value Disclosure Non-financial liabilities Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Transfer of assets from level 1 to level 2 Fair Value, Assets, Level 2 to Level 1 Transfers, Amount Transfer of assets from level 2 to level 1 Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount Transfer of liabilities from level 1 to level 2 Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount Transfer of liabilities from level 2 to level 1 Financial Liabilities Fair Value Disclosure Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Reconciliation of liabilities measured at fair value Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract] Assumptions used to determine the fair value Fair Value Assumptions, Risk Free Interest Rate Risk-free interest rate (as a percent) Fair Value Assumptions, Expected Volatility Rate Expected volatility (as a percent) Fair Value Assumptions, Expected Term Remaining contractual term Fair Value Assumptions, Expected Dividend Rate Expected dividend yield (as a percent) Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument Name [Domain] Debt Instrument Name [Domain] Represents information pertaining to the convertible promissory notes due on June 24, 2014 issued by the entity. Convertible Promissory Notes Due On24 June2014 [Member] Convertible Promissory Notes Due On24 June2014 [Member] Represents information pertaining to the convertible promissory notes due on August 8, 2016 issued by the entity. Convertible Promissory Notes Due On8 August2016 [Member] Convertible Promissory Notes Due On8 August2016 [Member] Secured Debt [Member] Secured Debt [Member] Class of Warrant or Right [Axis] Class Of Warrant Or Right [Domain] Class Of Warrant Or Right [Domain] Represents the security that gives the holder the right to purchase shares of series B convertible preferred stock in accordance with the terms of the instrument, usually upon payment of a specified amount. Convertible Series B Preferred Stock Warrants [Member] Convertible Series B Preferred Stock Warrants [Member] Represents the security that gives the holder the right to purchase shares of series C convertible preferred stock in accordance with the terms of the instrument, usually upon payment of a specified amount. Convertible Series C Preferred Stock Warrants [Member] Convertible Series C Preferred Stock Warrants [Member] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Represents information pertaining to warrants by expiration period. Warrants Expiration Period [Axis] Represents the period in which warrants expires. Warrants Expiration Period [Domain] Warrants Expiration Period [Domain] Represents details of warrants that expire in January 2019. Warrants Expiration Period January2019 [Member] Warrants Expiration Period January2019 [Member] Represents details of warrants that expire in August 2021. Warrants Expiration Period August2021 [Member] Warrants Expiration Period August2021 [Member] Debt Instrument [Line Items] Long-term debt Long-term Debt, Gross Long-term debt Represents the non-current portion of discount recognized at the issuance of debt. Debt Instrument Discount, Non Current Less debt discount, net of current portion Long-term Debt Long-term debt, net of debt discount Amount of long-term debt, before unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Long Term Debt, Gross, Current Less current portion of long-term debt Represents the current portion of discount recognized at the issuance of debt. Debt Instrument Discount, Current Current portion of debt discount Debt Instrument, Face Amount Debt issued Principal amount Debt Instrument, Interest Rate, Stated Percentage Interest rate (as a percent) Debt Instrument, Term Term of debt Period of maturity Interest Payable, Current Accrued interest, current Interest Payable Accrued interest, noncurrent Letters of Credit Outstanding, Amount Cash-collateralized irrevocable standby letter of credit Operating Leases, Future Minimum Payments Due Future minimum payments under the operating lease Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity Line of Credit Facility, Amount Outstanding Amount drawn under the credit facility Class of Warrant or Right, Number of Securities Called by Warrants or Rights Warrants issued (in shares) Class of Warrant or Right, Exercise Price of Warrants or Rights Exercise price (in dollars per share) Represents the additional payment to be made upon maturity as a percentage of maximum loan amount. Debt Instrument Additional Payment as Percentage of Maximum Loan Amount Additional payment upon maturity as a percentage of maximum loan amount Proceeds from Issuance of Warrants Warrants issued Proceeds from Lines of Credit Term Advances Represents the period for interest payments to be made by the entity. Debt Instrument Period for Interest Payments Period of interest only payments Represents the period for principal and interest payments to be made by the entity. Debt Instrument Period for Principal and Interest Payments Period for monthly principal and interest payments Adjustments to Additional Paid in Capital, Warrant Issued Warrant liability reclassified to additional paid-in capital Interest Expense, Debt Aggregate interest expense Represents information pertaining to 2007 Equity Incentive Plan. Equity Incentive Plan2007 [Member] Equity Incentive Plan2007 [Member] Represents information pertaining to 2013 Stock Option and Incentive Plan. Stock Option And Incentive Plan2013 [Member] Stock Option And Incentive Plan2013 [Member] Employee Stock [Member] Employee Stock [Member] Represents an arrangement whereby both an employee and a non-employee is entitled to receive in the future, subject to vesting and other restrictions, certain number of shares in the entity at a specified price, as defined in the agreement. Employee And Non Employee Stock Option [Member] Employee And Non Employee Stock Option [Member] Restricted Stock [Member] Restricted Stock [Member] Represents awards issued inside of the 2007 Plan and the 2013 Plan, combined. Inside Of Plan [Member] Inside Of Plan [Member] Represents awards issued outside of the 2007 Plan and the 2013 Plan, combined. Outside Of Plan [Member] Outside Of Plan [Member] Minimum [Member] Minimum [Member] Vesting [Axis] Vesting [Domain] Vesting [Domain] Represents the vesting based on performance. Vesting Based On Performance [Member] Vesting Based On Performance [Member] Represents information pertaining to cliff vesting. Cliff Vesting [Member] Cliff Vesting [Member] Represents the vesting based on achievement of performance-based milestones and market conditions. Vesting Based On Performance Based Milestones And Market Conditions [Member] Vesting Based On Performance Based Milestones And Market Conditions [Member] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Research And Development Expense [Member] Research And Development Expense [Member] General And Administrative Expense [Member] General And Administrative Expense [Member] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Balance at the end of the period (in shares) Balance at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Vested and expected to vest at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercisable at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted-Average Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Balance at the end of the period (in dollars per share) Balance at the beginning of the period (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Canceled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Vested and expected to vest at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Exercisable at the end of the period (in dollars per share) Allocated Share-based Compensation Expense Total stock-based compensation expense Represents the aggregate grant-date fair value of share-based compensation plan awards. Share Based Compensation Arrangement by Share Based Payment Award Total Grant Date Fair Value Aggregate grant date fair value Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Unrecognized compensation cost related to outstanding options Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Expected recognition period of unrecognized compensation cost Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Weighted-average assumptions to determine fair value of stock options Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Risk-free interest rate (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected volatility (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected dividend yield (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Stock options generally vested on first anniversary (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period General vesting period after first year Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Term of stock awards Common Stock, Capital Shares Reserved for Future Issuance Shares reserved for issuance Represents the percentage of additional shares authorized for issuance under an established share-based compensation plan as a proportion of outstanding capital stock. Share Based Compensation Arrangement by Share Based Payment Award Percentage of Additional Shares Authorized Additional shares authorized (as a percent) Represents the monthly vesting period of share-based compensation awards. Share-based Compensation Arrangement by Share-based Payment Award, Monthly Award, Vesting Period Monthly vesting period Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Additional shares authorized Stock Issued During Period, Shares, Employee Stock Purchase Plans Stock purchases under the plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Vested and expected to vest at the end of the period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Exercisable at the end of the period Share Based Compensation Arrangement by Share Based Payment Award Options Intrinsic Value [Abstract] Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Outstanding at the end of the period (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Vested and expected to vest at the end of the period (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Exercisable at the end of the period (in dollars) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted-average grant date fair value per share of employee options granted (in dollars per share) Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options Cash received upon exercise of options (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Balance at the end of the period (in shares) Balance at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Weighted-Average Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Balance at the end of the period (in dollars per share) Balance at the beginning of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Unvested shares issued (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Number of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] Common stock reserved for future issuance Represents number of offerings awarded to employees for purchase stock under the plan. Share Based Compensation Arrangement by Share Based Payment Award Number of Offerings Awarded to Employees Number of offerings awarded to employees Represents period of offerings awarded to employees for purchase stock under the plan. Share Based Compensation Arrangement by Share Based Payment Award Period Offerings Awarded to Employees Period of offerings awarded to employees Represents percentage of payroll deductions per employee who is participant to purchase shares under the plan. Share Based Compensation Arrangement by Share Based Payment Award Percentage of Payroll Deductions Per Employee Percentage of payroll deductions per employee under the plan Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Offering price as percentage fair market value of common stock Represents the amount considered to calculate purchase price of common stock. Share based Compensation Arrangement by Share based Payment Award Amount Considered to Calculate Purchase Price of Common Stock Amount considered to calculate offering price of common stock Represents the number of employees to purchase common stock during each offering period under the plan. Share based Compensation Arrangement by Share based Payment Award Number of Employees to Purchase Common Stock Number of employees to purchase common stock during each offering period Represent the amount of shares purchased on the open market during the period for issuance to employees under the plan. Share Based Compensation Arrangement by Share Based Payment Award Value of Shares Purchased for Award Amount of common stocks that may be purchased by employee Represents the number of shares outstanding, which are purchased in the open market for issuance to employees under the plan. Share Based Compensation Arrangement by Share Based Payment Award Common Stock Shares Outstanding Purchased for Award Outstanding shares of common stock subject to repurchase Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased Weighted-average exercise prices (in dollars per share) Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Represents information pertaining to the Amended and Restated Loan and Security Agreement. Amended And Restated Loan And Security Agreement [Member] Amended And Restated Loan And Security Agreement [Member] Long-term Debt, Type [Axis] Longterm Debt Type [Domain] Longterm Debt Type [Domain] Represents information pertaining to the term A loan matures on January 1, 2018. Term A Loan [Member] Term A Loan [Member] Represents information pertaining to the term loan B. Term B Loan [Member] Term B Loan [Member] Represents information pertaining to the term B loan tranche one. Term B Loan Tranche1 [Member] Term B Loan Tranche 1 [Member] Represents information pertaining to the term B loan tranche two. Term B Loan Tranche2 [Member] Term B Loan Tranche 2 [Member] Legal Entity [Axis] Subsequent Event [Line Items] Represents number of additional term B loan. Number of Additional Term Loans Number of additional term loans Debt Instrument Fee Amount Commitment fee Debt Instrument, Description of Variable Rate Basis Description of Variable rate Debt Instrument Basis Spread on Variable Rate1 Interest rate basic points (as a percent) Period of time for payment of interest on monthly basis on cash at the beginning of first day of each month, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Debt Instrument Term for Payment of Interest Number of monthly payment of interest Period of time for repayment of principal and accrued interest on equal monthly installments, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Debt Instrument Term for Repayment of Principal and Accrued Interest Number of equal monthly installments to repay principal and accrued interest The gross value of stock to be issued during the period upon the conversion of warrants. Stock To Be Issued During The Period Value Conversion Of Warrants Stock to be issued by conversion of affiliates warrants Represents the number of trading days to calculate average price per share prior to the funding date of loan. Number Of Trading Days To Calculate Average Price Per Share Prior To Funding Date Of Loan Number of trading days to calculate average price per share prior to funding date of loan Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Three Years Entity [Domain] Entity [Domain] Represents information pertaining to Silicon Valley Bank. Silicon Valley Bank [Member] Silicon Valley Bank [Member]