Fair Value Adjustment of Warrants Prior to Conversion Change in the fair value of the Series D redeemable convertible preferred stock warrant prior to conversion Amount of expense (income) related to adjustment to fair value of warrant liability prior to conversion. Shares to be Purchased on Issue of Exercise Notice by Holder of Warrants Shares of common stock to be purchased upon receipt of notice of exercise from holder of warrants Represents the number of shares to be purchased by on issue of exercise notice by the holder of warrants. Common Stock Capital Shares Reserved for Future Issuance Outstanding Restricted Stock Units Outstanding restricted stock units Number of outstanding restricted stock units reserved for future issuance pertaining to possible future issuance under stock option plans. Schedule representing recognition of revenue arrangements. Revenue Recognition [Table] Revenue Recognition [Line Items] Revenue Recognition and Deferred Revenue Period to Derive Revenue under Long Term Contracts Period to derive revenue under long-term contracts Represents the period to derive revenue under long-term contracts. Type of Contract [Axis] Type of Contract [Domain] Two Contracts with Same University [Member] Two contracts with same university Represents information pertaining to two contracts with same university. One Contract with University [Member] One contract with a university Represents information pertaining to one contract with a university. Amendment Description Capitalized Content Development Costs Useful Life Useful life of capitalized content development costs Represents the useful life of capitalized content development costs. Such life is expressed in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Amendment Flag Rebate Reserve [Abstract] Rebate Reserve Period of Teaching in Designated Low Income School to Get Rebate Period of teaching in designated low-income school to get rebate Represents the period for which the students should teach in designated low-income school to get rebate. Such life is expressed in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Capitalized Content Development Costs [Abstract] Capitalized Content Development Costs Schedule of Capitalized Content Development Costs [Table Text Block] Schedule of capitalized content development costs Tabular disclosure of capitalized content development costs. Payments for Capitalized Content Cost Capitalized content development cost expenditures The cash outflow associated with the capitalized content cost expenditures. Refunds Payable Current Refunds payable Represents the amount of refunds payable within one year of the balance sheet date or the normal operating cycle, whichever is longer. Rebate Reserve Noncurrent Rebate reserve Represents the amount of rebate reserve, which is expected to be paid after one year or beyond the next operating cycle, if longer. Initial Public Offering and Pro Forma Presentation [Policy Text Block] Initial Public Offering and Unaudited Pro Forma Presentation Disclosure of accounting policy for initial public offering and pro forma presentation. Accounting Policies [Table] A table or schedule providing information for all significant accounting policies of the reporting entity. Accounting Policies [Line Items] Initial Public Offering and Unaudited Pro Forma Presentation Underwriting Discounts and Commissions Expense Underwriting discounts and commissions Amount of underwriting discounts and commissions expense associated with the entity's first offering of stock to the public. Offering Costs Offering expenses Amount of offering costs associated with the entity's first offering of stock to the public. Offering costs Preferred Stock Warrant Liability Preferred stock warrant liability Amount of preferred stock warrant liability, reclassified to additional paid-in capital. Equity Incentive Plan 2014 [Member] 2014 Equity Incentive Plan Represents information pertaining to the 2014 Equity Incentive Plan. 2014 Plan Redeemable Convertible Series A Preferred Stock [Member] Series A Represents information related to redeemable convertible series A preferred stock. Redeemable convertible Series A preferred stock Redeemable Convertible Series B Preferred Stock [Member] Series B Represents information related to redeemable convertible series B preferred stock. Redeemable convertible Series B preferred stock Current Fiscal Year End Date Award Type [Axis] Represents information related to redeemable convertible series C preferred stock. Redeemable convertible Series C preferred stock Redeemable Convertible Series C Preferred Stock [Member] Series C Series D Represents information related to redeemable convertible series D preferred stock. Redeemable Convertible Series D Preferred Stock [Member] Redeemable convertible Series D preferred stock Warrants to Purchase Series C Redeemable Convertible Preferred Stock [Member] Warrant to purchase Series C redeemable convertible preferred stock Represents information pertaining to warrants that gives right to purchase series C redeemable convertible preferred stock. Warrants to Purchase Series D Redeemable Convertible Preferred Stock [Member] Warrants to purchase Series D redeemable convertible preferred stock Represents information pertaining to warrants that gives right to purchase series D redeemable convertible preferred stock. Weighted Average Number of Share Outstanding Basic and Diluted [Abstract] Denominator: Other Preferred Stock Dividends and Adjustment Accretion of deferred preferred stock offering costs Represents the amount of accretion of deferred offering or issuance costs related to temporary equity. Weighted Average Basic and Diluted Shares Outstanding Pro Forma Pro forma denominator for basic and diluted net loss per share attributable to common stockholders (in shares) The weighted average number of shares outstanding in the calculation of pro forma basic and diluted earnings per share. Common Stock Sold by Selling Stockholders Common stock sold by selling stockholders, including officers and directors (in shares) Represents the number of common shares sold by selling stockholders, including officers and directors of the entity. Gross Proceeds from Issuance Initial Public Offering Gross proceeds from the IPO The gross cash inflow associated with the amount received from entity's first offering of stock to the public. Warrant to Purchase Series D Redeemable Convertible Preferred Stock, Expiring in 2022 [Member] Warrant issued to purchase Series D redeemable convertible preferred stock expiring in 2022 Represents information pertaining to warrants that gives right to purchase series D redeemable convertible preferred stock and expiring in 2022. Warrant to Purchase Series D Redeemable Convertible Preferred Stock Expiring in 2023 [Member] Warrant issued to purchase Series D redeemable convertible preferred stock expiring in 2023 Represents information pertaining to warrants that gives right to purchase series D redeemable convertible preferred stock and expiring in 2023. Document Period End Date Warrants Disclosure [Text Block] Warrants Represents the entire disclosure pertaining to warrants. Class of Warrant or Right Amount Reclassified to Additional Paid in Capital on Conversion of Warrants Amount of warrants liability reclassified to additional paid in capital on conversion of warrants to purchase Series D redeemable convertible preferred stock Represents the amount reclassified to additional paid-in capital on conversion of warrants to purchase Series D redeemable convertible preferred stock to warrants to purchase common stock. Number of share-based employee compensation plans Represents the number of employee compensation plans under the share-based arrangements. Share Based Compensation Arrangements by Share Based Payment Award, Number of Employee Compensation Plans Period during which the number of authorized shares available for issuance under the 2014 Plan will automatically increase on an annual basis. Share Based Compensation Arrangement by Share Based Payment Award Period of Annual Automatic Increase in Shares Authorized Period of annual automatic increase in the number of shares authorized Share Based Compensation Arrangement by Share Based Payment Award, Percentage Applied on Outstanding Shares of Common Stock for Automatic Inclusion in Plan Percentage applied on total number of shares of common stock outstanding on previous calendar year for automatic inclusion in the plan Represents the percentage applied on the total number of shares of common stock outstanding on previous calendar year end for automatic inclusion in the share based compensation plan. Share-based Compensation Arrangement by Share-based Payment Award Options Weighted Average Remaining Contractual Term [Abstract] Weighted Average Remaining Contractual Term Granted Weighted average remaining contractual term for options granted in period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Share-based Compensation Arrangement by Share-based Payment Award Options Grants in Period Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award Options Exercises in Period Weighted Average Remaining Contractual Term Exercised Weighted average remaining contractual term for options exercised in period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Share Based Compensation Arrangement by Share Based Payment Award Options Intrinsic Value [Abstract] Aggregate Intrinsic Value Represents the amount advanced to customers or clients which are receivable within one year of the balance sheet date or the normal operating cycle, whichever is longer. Advance to Clients Current Advance to clients, current Advance to Clients Noncurrent Advance to clients, non-current Represents the amount advanced to customers or clients which are usually receivable after one year (or one business cycle). Temporary Equity [Text Block] Redeemable Convertible Preferred Stock The entire disclosure of temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. Schedule of Increase (Decrease) in Temporary Equity [Table Text Block] Schedule of activity for the redeemable convertible preferred stock issued and outstanding Tabular disclosure of increase (decrease) in temporary equity of the entity. Temporary Equity Conversion Price, Per Share Conversion Price per Share (in dollars per share) The conversion price per share of temporary equity. Common Stock and Preferred Stock Reserved for Future Issuance Common Stock Reserved for Future Issuance [Text Block] Common Stock and Preferred Stock Reserved for Future Issuance The entire disclosure for common stock reserved for future issuance. Schedule of Shares of Common Stock Reserved for Future Issuance [Table Text Block] Schedule of shares of common stock reserved for future issuance Tabular disclosure of shares of common stock reserved for future issuance. Common Stock Capital Shares Reserved for Future Issuance [Abstract] Shares of common stock reserved for future issuance Common Stock Capital Shares Reserved for Future Issuance Conversion of Redeemable Convertible Preferred Stock For conversion of Series A, Series B, Series C and Series D redeemable convertible preferred stock Number of common shares reserved for future issuance pertaining to conversion of redeemable convertible preferred stock. Common Stock Capital Shares Reserved for Future Issuance Outstanding Stock Options Outstanding stock options Number of common shares reserved for future issuance pertaining to outstanding stock options. Outstanding stock warrants Number of common shares reserved for future issuance pertaining to outstanding stock warrants. Common Stock Capital Shares Reserved for Future Issuance Outstanding Stock Warrants Common Stock Capital Shares Reserved for Future Issuance Possible Future Issuance under Stock Option Plans Possible future issuance under stock option plans Number of common shares reserved for future issuance pertaining to possible future issuance under stock option plans. Capital Stock Shares, Authorized The maximum number of shares of capital stock permitted to be issued by the entity's charter and bylaws. Authorized shares of capital stock Servicing and Support Costs Servicing and support Represents the amount of servicing and support costs consisting primarily of compensation costs related to program management and operations, as well as costs for platform technical support and faculty and student support. Servicing and Support [Member] Servicing and support Represents information related to servicing and support cost. Technology and Content Development [Member] Technology and content development Represents information related to technology and content development cost. Increase (Decrease) in Advances to Clients Advances to clients Represents the amount of increase (decrease) during the reporting period in advances to clients. Refunds payable Represents the amount of increase (decrease) during the reporting period in refunds payable. Increase (Decrease) in Refunds Payable Increase (Decrease) in Rebate Reserve Rebate reserve Represents the amount of increase (decrease) during the reporting period in rebate reserve. Document and Entity Information Capitalized Content Development Costs Net Capitalized content development costs, net Represents the value, net of accumulated amortization of capitalized content development costs. Capitalized content development costs, net Capitalized Content Development Costs Capitalized Content Development Costs [Text Block] Capitalized Content Development Costs The entire disclosure for all or part of the information related to capitalized content development costs. Schedule of Capitalized Content Development Costs Future Amortization Expense [Table Text Block] Schedule of estimated future amortization expense for the capitalized content development costs Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for capitalized content development costs. Capitalized Content Development Costs Future Amortization Expense Current and Five Succeeding Fiscal Years [Abstract] Estimated future amortization expense for the capitalized content development costs Future Amortization Expenses Remainder of Fiscal Year 2014 The amount of amortization expense expected to be recognized during the remainder of the current fiscal year. Future Amortization Expenses after Year Five Thereafter The amount of amortization expense expected to be recognized after the fifth succeeding fiscal year. Offering Costs Of Initial Public Offering Offering costs Amount of offering costs associated with the entity's first offering of stock to the public. Common Stock Granted Common stock granted in exchange for consulting services received Represents the value of common stock granted in noncash investing or financing activities. Other Noncurrent Assets [Policy Text Block] Other Non-Current Assets Disclosure of accounting policy related to non-current assets. Refunds Payable [Policy Text Block] Refunds Payable Disclosure of accounting policy related to refunds payable. Rebate Reserve [Policy Text Block] Rebate Reserve Disclosure of accounting policy related to rebate reserve. Advances to Clients [Policy Text Block] Advances to Clients Disclosure of accounting policy related to advances to clients. Capitalized Content Development Costs Excluding in Process Costs, Gross Capitalized content development costs Represents the gross value before accumulated amortization of capitalized content development costs, excluding in process costs. Capitalized Content Development Costs in Process, Gross Capitalized content development costs in process Represents the gross value before accumulated amortization of capitalized content development costs in process. Accumulated Amortization Accumulated amortization Represents the value of accumulated amortization of capitalized content development costs. Amortization Expense of Capitalized Content Development Costs Amortization expense related to capitalized content development costs Represents the amortization expense related to capitalized content development costs. 2015 The amount of amortization expense expected to be recognized during year two of the five succeeding fiscal years. Future Amortization Expense Year Two 2016 Future Amortization Expense Year Three The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years. Future Amortization Expenses Year Four 2017 The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years. 2018 Future Amortization Expense Year Five The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years. Total Capitalized Content Development Costs Excluding in Process Costs Net Represents the net value after accumulated amortization of capitalized content development costs, excluding in process costs. Period Beginning within of Teaching in Designated Low Income School to get Rebate Period start with in teaching in designated low-income school to get rebate Represents the period start within of which the students should teach in designated low-income school to get rebate. Such life is expressed in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Entity Well-known Seasoned Issuer Payments for Deferred Offering Costs Payment of deferred offering costs Represents the amount paid for specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period. Entity Voluntary Filers Stock Issued During Period Shares Exercise of Warrants to Purchase Common Stock Issuance of shares of common stock upon receipt of notice of exercise from holder of warrants Exercise of warrants to purchase common stock (in shares) Number of warrants to purchase common stock exercised during the current period. Entity Current Reporting Status Adjustments to Additional Paid in Capital Conversion of Warrants Conversion of Series D warrant to common stock warrant Amount of increase in additional paid in capital (APIC) resulting from the conversion of warrants to purchase Series D redeemable convertible preferred stock to warrants to purchase common stock. Entity Filer Category Temporary Equity Conversion of Convertible Securities Conversion of preferred stock into common stock Represents the conversion of temporary equity securities into permanent equity. Entity Public Float Initial Public Offering Policy [Text Block] Initial Public Offering Disclosure of accounting policy for initial public offering. Entity Registrant Name Initial Public Offering [Abstract] Initial Public Offering Entity Central Index Key Represents the fair value adjustment of warrants allocated to interest expense. Interest Expense on Fair Value Adjustment of Warrants Interest expense on fair value adjustment of the warrants Number of Trading Days Considered in Volume Weighted Average Price of Common Stock Number of trading days considered in volume weighted average price of common stock Number of trading days considered in volume weighted average price of common stock Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Summary of Significant Accounting Policies Accounts receivable, net Accounts Receivable, Net, Current Accounts payable Accounts Payable, Current Accounts Receivable [Member] Accounts receivable Accrued expenses and other current liabilities Accrued Liabilities and Other Liabilities Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Loss Additional paid-in capital Additional Paid in Capital Additional Paid-in Capital [Member] Additional Paid-In Capital Adjustments to reconcile net loss to net cash (used in) provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation expense Stock-based compensation expense Allocated Share-based Compensation Expense Total stock-based compensation expense Amortization of deferred financing costs Amortization of Financing Costs Antidilutive Securities [Axis] Potential dilutive securities that would have been anti-dilutive Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Potential dilutive securities that would have been anti-dilutive due to net loss (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Loss on asset disposal Asset Impairment Charges Assets, Fair Value Disclosure [Abstract] Assets: Total assets Assets Current assets: Assets, Current [Abstract] Assets Assets [Abstract] Total current assets Assets, Current Pro forma net loss per share attributable to common stockholders, basic and diluted (in dollars per share) Basic Earnings Per Share, Pro Forma Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Capitalized Content Development Costs Capitalization of Internal Costs, Policy [Policy Text Block] Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Fair Value Disclosure Cash equivalents Supplemental disclosure of non-cash investing and financing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Class of Warrant or Right [Axis] Class of Warrant or Right [Domain] Number of shares of redeemable convertible preferred stock that may be purchased by warrants Class of Warrant or Right, Number of Securities Called by Warrants or Rights Number of shares of preferred stock that may be purchased by warrant Exercise price of warrant (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Warrants Class of Warrant or Right [Line Items] Class of Stock [Domain] Class of Warrant or Right [Table] Commitments and Contingencies Commitments and contingencies (Note 6) Commitments and Contingencies. Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Par value of common stock (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Common Stock [Member] Common Stock Common stock, $0.001 par value, 60,000,000 shares authorized, 7,629,133 shares issued and outstanding as of December 31, 2013; 200,000,000 shares authorized, 40,259,230 shares issued and outstanding as of June 30, 2014 Common Stock, Value, Issued Common stock, shares issued Common Stock, Shares, Issued Common Stock, Shares Authorized Authorized shares of common stock Common stock, shares authorized Total common shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Common stock, shares outstanding Common Stock, Shares, Outstanding Balance (in shares) Balance (in shares) Comprehensive Loss Comprehensive Income, Policy [Policy Text Block] Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Computer hardware Computer Equipment [Member] Concentration Risk Type [Domain] Concentration Risk [Line Items] Concentration of Credit Risk Concentration Risk Benchmark [Domain] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentration Risk Type [Axis] Concentration Risk [Table] Concentration Risk Benchmark [Axis] Concentration Risk, Percentage Percentage of concentration of credit risk Principles of Consolidation Consolidation, Policy [Policy Text Block] Redeemable convertible preferred stock converted into shares of common stock Conversion of Stock, Shares Issued Number of shares of common stock issued upon conversion of outstanding redeemable convertible preferred stock Costs and expenses: Costs and Expenses [Abstract] Total costs and expenses Costs and Expenses Credit Concentration Risk [Member] Credit concentration risk Customer Concentration Risk [Member] Customer concentration risk Debt Conversion, Converted Instrument, Shares Issued Promissory note converted into shares of redeemable convertible preferred stock Conversion of debt to redeemable convertible preferred stock Debt Conversion, Converted Instrument, Amount Deferred revenue Deferred Revenue, Current Total net rent expense Deferred Rent Credit Federal net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Domestic State net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, State and Local Depreciation expense Depreciation Depreciation and amortization Depreciation, Depletion and Amortization Related party receivables Due from Related Parties, Noncurrent Pro Forma Loss Per Share Earnings Per Share, Pro Forma [Abstract] Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) Pro forma basic and diluted net loss per share attributable to common stockholders (in dollars per share) Net Loss per Share Earnings Per Share [Text Block] Basic and Diluted Loss per Common Share Earnings Per Share, Policy [Policy Text Block] Net Loss per Share Net loss per share attributable to common stockholders: Effective tax rate (as a percent) Effective Income Tax Rate Reconciliation, Percent Stock-based compensation expense included in the unaudited condensed consolidated statements of operations Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Stock options Employee Stock Option [Member] Option activity Additional future period share-based compensation expense to be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Compensation cost related to the nonvested awards not yet recognized Weighted-average period for recognition of share-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Weighted average period for recognition of compensation cost Equity Component [Domain] Estimate of Fair Value Measurement [Member] Total Measurement Frequency [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Recurring [Member] Recurring basis Fair Value, Measurement Frequency [Domain] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Changes in the fair value of the warrant to purchase Series D redeemable convertible preferred stock Fair Value Adjustment of Warrants Reductions of interest expense Change in the fair value of the Series D redeemable convertible preferred stock warrant prior to conversion Change in fair value of warrant liability Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets and liabilities measured at fair value on a recurring basis Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Measurements Fair Value Disclosures [Text Block] Schedule of the changes in the Company's Level 3 instruments measured at fair value on a recurring basis Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Inputs, Level 3 [Member] Level 3 Change in the fair value of Series D Warrants Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value, Inputs, Level 2 [Member] Level 2 Furniture and office equipment Furniture and Fixtures [Member] General and administrative General and Administrative Expense General and administrative General and Administrative Expense [Member] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Condensed Consolidated Statements of Operations Income Statement Location [Axis] Income Taxes Income Taxes Income Tax Disclosure [Text Block] Income Statement Location [Domain] Income tax expense Income Tax Expense (Benefit) Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Related party receivable Increase (Decrease) in Due from Related Parties Accounts receivable, net Increase (Decrease) in Accounts Receivable Increase (Decrease) in Temporary Equity [Roll Forward] Summary of activity for the Preferred Stock issued and outstanding Accounts payable Increase (Decrease) in Accounts Payable Deferred revenue Increase (Decrease) in Deferred Revenue Other liabilities Increase (Decrease) in Other Operating Liabilities Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Other assets Increase (Decrease) in Other Operating Assets Prepaid expenses Increase (Decrease) in Prepaid Expense Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Plus: conversion of redeemable convertible preferred stock to common stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Interest expense incurred in connection with convertible debt Interest Expense, Debt, Excluding Amortization Interest expense Interest Expense Interest income Investment Income, Interest Leasehold improvements Leasehold Improvements [Member] Total current liabilities Liabilities, Current Total liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) Liabilities and Equity Deferred offering costs included in accounts payable and accrued expenses Liabilities Assumed Current liabilities: Liabilities, Current [Abstract] Total liabilities Liabilities Liabilities, redeemable convertible preferred stock and stockholders' equity (deficit) Liabilities and Equity [Abstract] Liabilities, Fair Value Disclosure [Abstract] Liabilities: Line of Credit Facility [Abstract] Line of Credit Line of Credit Facility, Maximum Borrowing Capacity Aggregate borrowing base Amount outstanding Line of Credit Facility, Amount Outstanding Maximum Maximum [Member] Minimum Minimum [Member] Description of the Business Nature of Operations [Text Block] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Net loss attributable to common stockholders Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash used in investing activities Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Net loss Net Income (Loss) Attributable to Parent Net loss Historical net loss attributable to common stockholders Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Total other income (expense) Nonoperating Income (Expense) Other income (expense): Nonoperating Income (Expense) [Abstract] Number of reportable segments Number of Reportable Segments Operating Leases, Future Minimum Payments, Due Thereafter Thereafter Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Future minimum lease payments, net of aggregate expected sublease payments Operating Leases, Future Minimum Payments, Due in Four Years 2017 Operating Leases, Future Minimum Payments, Due in Five Years 2018 Sublease income Operating Leases, Rent Expense, Sublease Rentals Operating Leases, Future Minimum Payments, Due in Three Years 2016 Rent expense net of sublease income Operating Leases, Rent Expense, Net Operating Leases, Future Minimum Payments, Remainder of Fiscal Year 2014 Loss from operations Operating Income (Loss) Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Aggregate expected sublease payments Operating Leases, Future Minimum Payments, Due in Two Years 2015 Operating Leases, Future Minimum Payments Due Total future minimum lease payments Description of the Business Other non-current assets Other Assets, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Other Preferred Stock Dividends and Adjustments Accretion of issuance costs on redeemable convertible preferred stock Preferred stock accretion Accretion of issuance costs on redeemable convertible preferred stock Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Change in foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Repurchase of common shares Payments for Repurchase of Common Stock Payments for (Proceeds from) Other Investing Activities Other investing activities Payments to Acquire Productive Assets Expenditures for property and equipment Plan Name [Domain] Plan Name [Axis] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, $0.001 par value, 0 shares authorized, issued and outstanding as of December 31, 2013; 5,000,000 shares authorized, 0 shares issued and outstanding as of June 30, 2014 Preferred Stock, Value, Issued Preferred stock, shares issued Preferred Stock, Shares Issued Authorized shares of preferred stock Preferred Stock, Shares Authorized Preferred stock, shares authorized Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Prepaid expenses Prepaid Expense, Current Pro Forma Pro Forma [Member] Proceeds from issuance of convertible debt Proceeds from Convertible Debt Convertible promissory note issued Proceeds from Lines of Credit Amount borrowed Net proceeds from IPO, after deducting underwriting discounts and commissions and other offering expenses Proceeds from Issuance Initial Public Offering Net proceeds from IPO, after deducting underwriting discounts and commissions and other offering expenses Proceeds from issuance of Series D redeemable convertible preferred stock, net of issuance costs Proceeds from Issuance of Redeemable Convertible Preferred Stock Proceeds from issuance of common stock, net of offering costs Proceeds from Issuance of Common Stock Proceeds from exercise of stock options Proceeds from Stock Options Exercised Useful life Property, Plant and Equipment, Useful Life Property and equipment, gross Property, Plant and Equipment, Gross Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Property and equipment, net Property, Plant and Equipment, Net Property and equipment, net Property and Equipment Schedule of Property and equipment Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Axis] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Property and equipment Property, Plant and Equipment [Line Items] Range [Axis] Range [Domain] Repayments of Lines of Credit Borrowings repaid RSUs Restricted Stock Units (RSUs) [Member] Restricted stock units Retained Earnings [Member] Accumulated Deficit Accumulated deficit Retained Earnings (Accumulated Deficit) Revenue Recognition and Deferred Revenue Revenue Recognition, Policy [Policy Text Block] Exercisable 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