Entity Central Index Key Document and entity information. Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Information [Table] Document Information [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Statement Of Financial Position [Abstract] Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Marketable securities Marketable Securities Current Licensor receivable Other Receivables Net Current Prepaid expenses and other, current Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Prepaid expenses and other, long-term Prepaid Expense And Other Assets Noncurrent Restricted cash Restricted Cash And Cash Equivalents At Carrying Value Total assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses Accrued Liabilities Current Total current liabilities Liabilities Current Deferred rent Deferred Rent Credit Noncurrent Total liabilities Liabilities Stockholders' equity: Stockholders Equity [Abstract] Common stock - $.0001 par value; 100,000,000 shares authorized; 30,117,819 issued and outstanding at June 30, 2014, and 28,991,289 issued and outstanding at December 31, 2013 Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive income Accumulated Other Comprehensive Income Loss Net Of Tax Deficit accumulated during the development stage Development Stage Enterprise Deficit Accumulated During Development Stage Total stockholders' equity Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Income Statement [Abstract] Income Statement [Abstract] Operating expenses: Operating Expenses [Abstract] General and administrative General And Administrative Expense Research and development Research And Development Expense Totals Operating Expenses Loss from operations Operating Income Loss Other income (expenses): Nonoperating Income Expense [Abstract] Interest income Investment Income Interest Other (expense) Other Nonoperating Income Expense Totals Nonoperating Income Expense Net loss Net Income Loss Net loss applicable to common stock Net Income Loss Available To Common Stockholders Basic Net loss per common share—basic and diluted Earnings Per Share Basic And Diluted Weighted-average common shares outstanding—basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Statement Of Income And Comprehensive Income [Abstract] Statement Of Income And Comprehensive Income [Abstract] Net loss Other comprehensive income (loss): Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Other comprehensive income (loss) Unrealized gain (loss) on available-for-sale securities Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Issuance of common stock in exchange for convertible notes shares. Issuance of common stock in exchange for convertible notes value. Statement Of Stockholders Equity [Abstract] Statement Of Stockholders Equity [Abstract] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income [Member] Deficit Accumulated During the Development Stage Accumulated Deficit During Development Stage [Member] Subsidiary, Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock, Name of Transaction Sale Of Stock Name Of Transaction [Domain] Private Placement Private Placement [Member] Public offering. Public Offering Public Offering [Member] Beginning Balance Common stock issued for cash (in shares) Stock Issued During Period Shares Issued For Cash Common stock issued for cash Stock Issued During Period Value Issued For Cash Paid-in capital Adjustments To Additional Paid In Capital Other Conversion of stockholder's note payable to equity (in shares) Issuance Of Common Stock In Exchange For Convertible Notes Shares Conversion of stockholder's note payable to equity Issuance Of Common Stock In Exchange For Convertible Notes Value Stock option compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Anti-dilutive warrant Adjustments To Additional Paid In Capital Warrant Issued Exercises of stock options (in shares) Stock Issued During Period Shares Stock Options Exercised Exercises of stock options Stock Issued During Period Value Stock Options Exercised Unrealized Gain (loss) on available for sale securities Issuance of common stock (in shares) Stock Issued During Period Shares New Issues Issuance of common stock Stock Issued During Period Value New Issues Ending Balance Ending Balance (in shares) Shares Outstanding Issuance of common stock, per share Equity Issuance Per Share Amount Statement Of Cash Flows [Abstract] Statement Of Cash Flows [Abstract] Operating activities: Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Adjustments to reconcile net loss to net cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation And Amortization Build-out allowance received from landlord Other Noncash Income Expense Stock option expense Share Based Compensation Anti-dilutive warrant Adjustment Of Warrants Granted For Services Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Licensor receivable Increase Decrease In Other Receivables Prepaid expenses and other Increase Decrease In Prepaid Expenses Other Accounts payable Increase Decrease In Accounts Payable Accrued expenses Increase Decrease In Accrued Liabilities Accrual of deferred rent Increase Decrease In Deferred Leasing Fees Net cash used in operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Investing activities: Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Purchase of property and equipment Payments For Proceeds From Productive Assets Expenditures for leasehold improvements Payments For Capital Improvements Restricted cash Increase Decrease In Restricted Cash Purchase of available-for-sale securities Payments To Acquire Available For Sale Securities Sale/maturity of available-for-sale securities Proceeds From Sale And Maturity Of Available For Sale Securities Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Financing activities: Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Proceeds from issuance of stockholder's convertible note payable Proceeds From Related Party Debt Net proceeds from issuance of common stock Proceeds From Issuance Of Common Stock Net proceeds from exercise of stock options Proceeds From Stock Options Exercised Capital contributions by stockholder Proceeds From Contributed Capital Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Net increase (decrease) in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental disclosures of non-cash investing and financing activities: Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Conversion of stockholder's note payable to common stock Debt Conversion Converted Instrument Amount1 Text Block [Abstract] Business and Basis of Presentation Business Description And Basis Of Presentation [Text Block] Significant Accounting Policies Significant Accounting Policies [Text Block] Prepaid expense and other assets. Prepaid Expenses and Other Prepaid Expense And Other Assets [Text Block] Property and Equipment Property Plant And Equipment Disclosure [Text Block] Accrued Expenses Accounts Payable And Accrued Liabilities Disclosure [Text Block] Stockholders' Equity Stockholders Equity Note Disclosure [Text Block] Subsequent Events Subsequent Events [Text Block] Use of Estimates Use Of Estimates Principles of Consolidation Consolidation Policy [Text Block] Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Licensor Receivable Receivables Policy [Text Block] Marketable Securities Marketable Securities Policy Assets Measured at Fair Value on a Recurring Basis Fair Value Of Financial Instruments Policy Concentration of Risk Concentration Risk Credit Risk Property and Equipment Property Plant And Equipment Policy [Text Block] Research and Development Expenses Research And Development Expense Policy Reimbursable expenses. Research and Development Reimbursement Reimbursable Expenses Policy [Text Block] Stock-Based Compensation Share Based Compensation Option And Incentive Plans Policy Net Loss per Common Share Earnings Per Share Policy [Text Block] Deferred Rent Lease Policy [Text Block] Recently Issued Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Assets Measured at Fair Value on Recurring Basis Fair Value Assets Measured On Recurring Basis [Text Block] Prepaid expense and other assets. Components of Prepaid Expenses and Other Prepaid Expense And Other Assets Table [Text Block] Property and Equipment Property Plant And Equipment [Text Block] Accrued Expenses Schedule Of Accrued Liabilities Table [Text Block] Recognized Expense of Share Based Compensation Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Fair Value Options Weighted-Average Assumptions Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Activity with Respect to Options Granted Schedule Of Share Based Compensation Activity Table [Text Block] Stock Options Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Table [Text Block] Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization consolidation and presentation of financial statements disclosure. Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization consolidation and presentation of financial statements disclosure. Organization Consolidation And Presentation Of Financial Statements Disclosure [Table] Organization Consolidation And Presentation Of Financial Statements Disclosure [Table] Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] Cash flows from operating activities Noncash or part noncash acquisition noncash financial or equity instrument shares received. Merger stock conversion ratio. Merger agreement, shares Issued Noncash Or Part Noncash Acquisition Noncash Financial Or Equity Instrument Consideration Shares Issued1 Merger agreement, shares received in exchange Noncash Or Part Noncash Acquisition Noncash Financial Or Equity Instrument Shares Received Merger agreement, shares exchange ratio Merger Stock Conversion Ratio Share redeemed, aggregate consideration Payments For Repurchase Of Common Stock Merger related Professional fees paid Payments For Merger Related Costs Consideration paid for former Stockholders of IAC and their attorney Other Expenses Cash equivalents original maturity. Cash And Cash Equivalents [Abstract] Significant accounting policies. Cash And Cash Equivalents [Abstract] Significant accounting policies. Significant Accounting Policies [Table] Significant Accounting Policies [Table] Range Range [Axis] Range Range [Member] Maximum Maximum [Member] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Cash equivalents, original maturity Cash Equivalents Original Maturity Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Measurement Frequency Fair Value By Measurement Frequency [Axis] Fair Value, Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value Measurements Recurring [Member] Investment Type Investment Type [Axis] Investments Investment Type Categorization [Member] Corporate bonds Corporate Bond Securities [Member] US government U S Government Debt Securities [Member] Commercial paper Commercial Paper [Member] Fair Value, Hierarchy Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Cash equivalents Cash And Cash Equivalents Fair Value Disclosure Marketable securities Investments Fair Value Disclosure Total Assets Fair Value Disclosure Cash and cash equivalents in excess of insured limits Cash Uninsured Amount Minimum Minimum [Member] Property and equipment, useful lives Property Plant And Equipment Useful Life License agreement number of days to review invoice and supporting documentation. Reduction in excess cap costs. License Agreement, number of days to review the invoice and supporting documentation License Agreement Number Of Days To Review Invoice And Supporting Documentation Costs of excess cap billed to the licensor Cost Of Reimbursable Expense Reduction in expense related to the excess cap costs Reduction In Excess Cap Costs Performance share expense recognition period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Antidilutive Securities Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Stock option Stock Option [Member] Performance Shares Performance Shares [Member]