Entity Central Index Key Document And Entity Information [Abstract] 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 Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Irrevocable transfer of an asset from a related party which is expected to settle within one year. Advance payments under license agreement. Collaboration agreement contingent liability noncurrent. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Convertible series A preferred stock. Series A Convertible Preferred Stock Convertible Series A Preferred Stock [Member] Convertible series B preferred stock. Series B Convertible Preferred Stock Convertible Series B Preferred Stock [Member] 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 Restricted cash Restricted Cash And Cash Equivalents At Carrying Value Receivables from collaboration and license agreement Accounts Receivable Net Current Notes receivable Notes And Loans Receivable Net Current Notes receivable from related parties Notes Receivable Related Parties Current Prepaid assets Prepaid Expense Current Other assets Other Assets Current Other assets - related party Other Assets Current Related Parties Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Intangible assets Intangible Assets Net Excluding Goodwill Goodwill Goodwill Other assets, non-current Other Assets Noncurrent Total assets Assets Liabilities, Convertible Preferred Stock and Stockholders’ Equity (Deficit) Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accounts payable - related parties Accounts Payable Related Parties Current Accrued liabilities Accrued Liabilities Current Advance payments under license agreement Advance Payments Under License Agreement Deferred revenue Deferred Revenue Current Convertible notes Convertible Notes Payable Current Convertible notes - related parties Notes Payable Related Parties Classified Current Contingent consideration Business Combination Contingent Consideration Liability Current Convertible preferred stock warrant liability Financial Liabilities Fair Value Disclosure Other liabilities Other Liabilities Current Total current liabilities Liabilities Current Deferred revenue, non-current Deferred Revenue Noncurrent Contingent liability to collaborator Collaboration Agreement Contingent Liability Noncurrent Contingent consideration, non-current Business Combination Contingent Consideration Liability Noncurrent Other liabilities, non-current Other Liabilities Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 8) Commitments And Contingencies Convertible preferred stock Temporary Equity Carrying Amount Attributable To Parent Stockholders’ equity (deficit): Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Preferred stock, $0.0001 par value; Shares authorized: 5,000,000 at December 31, 2014; Shares issued and outstanding: no shares at December 31, 2014 and 2013. Preferred Stock Value Common stock, $0.0001 par value; Shares authorized: 300,000,000 at December 31, 2014; Shares issued and outstanding: 33,257,978 and 4,837,715 at December 31, 2014 and 2013, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total Coherus stockholders' equity (deficit) Stockholders Equity Non-controlling interest Minority Interest Total stockholders' equity (deficit) Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total liabilities, convertible preferred stock and stockholders’ equity (deficit) Liabilities And Stockholders Equity Convertible preferred stock, par value Temporary Equity Par Or Stated Value Per Share Convertible preferred stock, shares authorized Temporary Equity Shares Authorized Convertible preferred stock, shares issued Temporary Equity Shares Issued Convertible preferred stock, shares outstanding Temporary Equity Shares Outstanding Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding 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] Related Party Related Party Transactions By Related Party [Axis] Related Party Related Party [Domain] Daiichi Sankyo. Daiichi Sankyo - Related Party Daiichi Sankyo [Member] Type of Arrangement and Non-arrangement Transactions Type Of Arrangement [Axis] Arrangements and Non-arrangement Transactions Arrangements And Nonarrangement Transactions [Member] Baxter license agreement. Baxter License Agreement Baxter License Agreement [Member] Revenue: Revenues [Abstract] Collaboration and license revenue License And Services Revenue Other revenue Other Sales Revenue Net Total revenue Sales Revenue Net Operating expenses: Operating Expenses [Abstract] Research and development (includes related party of $21,723, $9,471 and $16,777 for the years ended December 31, 2014, 2013 and 2012, respectively) Research And Development Expense General and administrative (includes related party of $597, $18 and $61 for the years ended December 31, 2014, 2013 and 2012, respectively) General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Interest expense (includes related party of $2,687, $4,026 and $1,059 for the years ended December 31, 2014, 2013 and 2012, respectively) Interest Expense Other income (expense), net Other Nonoperating Income Expense Net loss Profit Loss Net loss attributable to non-controlling interest Net Income Loss Attributable To Noncontrolling Interest Net loss attributable to Coherus Net Income Loss Net loss per share attributable to Coherus, basic and diluted Earnings Per Share Basic And Diluted Weighted-average number of shares used in computing net loss per share attributable to Coherus, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Related party transaction research and development expense. Research and development from transactions with related party Related Party Transaction Research And Development Expense General and administrative expenses from transactions with related party Related Party Transaction Selling General And Administrative Expenses From Transactions With Related Party Interest expense from transactions with related party Interest Expense Related Party Statement Of Income And Comprehensive Income [Abstract] Net loss Other comprehensive loss: Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Foreign currency translation adjustments, net of tax Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Comprehensive loss attributable to non-controlling interest Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive loss attributable to Coherus Comprehensive Income Net Of Tax Amount of increase (decrease) in additional paid in capital (APIC) resulting from the conversion of debt with a beneficial conversion feature. Temporary equity stock issued during period value upon acquisition. Temporary equity stock issued during period shares upon acquisition. Temporary equity stock issued during period shares new issues. Temporary equity stock issued during period value upon conversion of convertible promissory notes. Temporary equity stock issued during period shares upon conversion of convertible promissory notes. Temporary equity stock issued during period value in exchange for services. Temporary equity stock issued during period shares in exchange for services. Temporary equity stock issued during period value upon exercise of warrants including the reclassification of the associated convertible preferred stock warrant liability. Temporary equity stock issued during period shares upon exercise of warrants including the reclassification of the associated convertible preferred stock warrant liability. Amount of vesting of restricted stock awards during the period. This line item reduces the liability for unvested shares and increases APIC as the shares vest. Statement Of Stockholders Equity [Abstract] Series C convertible preferred Stock. Series C Convertible Preferred Stock Series C Convertible Preferred Stock [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] IPO I P O [Member] 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 (Loss) Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Total Coherus Stockholder Equity (Deficit) Parent [Member] Noncontrolling Interest Noncontrolling Interest [Member] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Warrant Warrant [Member] Beginning Balances Beginning Balances, Shares Beginning Balances Temporary Equity Carrying Amount Including Portion Attributable To Noncontrolling Interests Beginning Balances, Shares Beneficial conversion feature related to convertible notes issued in 2011/2013 Adjustments To Additional Paid In Capital Convertible Debt With Beneficial Conversion Feature Issuance of convertible preferred stock for InteKrin acquisition Temporary Equity Stock Issued During Period Value Upon Acquisition Issuance of convertible preferred stock for InteKrin acquisition, Shares Temporary Equity Stock Issued During Period Shares Upon Acquisition Issuance of convertible preferred stock net of issuance costs Temporary Equity Stock Issued During Period Value New Issues Issuance of convertible preferred stock net of issuance costs, Shares Temporary Equity Stock Issued During Period Shares New Issues Issuance of convertible preferred stock value upon conversion of convertible promissory notes Temporary Equity Stock Issued During Period Value Upon Conversion Of Convertible Promissory Notes Issuance of convertible preferred stock shares upon conversion of convertible promissory notes, Shares Temporary Equity Stock Issued During Period Shares Upon Conversion Of Convertible Promissory Notes Issuance of convertible preferred stock in exchange for services Temporary Equity Stock Issued During Period Value In Exchange For Services Issuance of convertible preferred stock in exchange for services, Shares Temporary Equity Stock Issued During Period Shares In Exchange For Services Issuance of convertible preferred stock upon exercise of warrants, including the reclassification of the associated convertible preferred stock warrant liability Temporary Equity Stock Issued During Period Value Upon Exercise Of Warrants Including The Reclassification Of The Associated Convertible Preferred Stock Warrant Liability Issuance of convertible preferred stock upon exercise of warrants, including the reclassification of the associated convertible preferred stock warrant liability, Shares Temporary Equity Stock Issued During Period Shares Upon Exercise Of Warrants Including The Reclassification Of The Associated Convertible Preferred Stock Warrant Liability Issuance of common stock in connection with initial public offering Stock Issued During Period Value New Issues Issuance of common stock in connection with initial public offering, Shares Stock Issued During Period Shares New Issues Conversion of convertible preferred stock and common stock warrants to common stock in connection with initial public offering Stock Issued During Period Value Conversion Of Convertible Securities Conversion of convertible preferred stock and common stock warrants to common stock in connection with initial public offering, Shares Stock Issued During Period Shares Conversion Of Convertible Securities Issuance of common stock options in exchange for services Stock Issued During Period Value Issued For Services Issuance of common stock upon exercise of options for cash Stock Issued During Period Value Stock Options Exercised Issuance of common stock upon exercise of options for cash, Shares Stock Issued During Period Shares Stock Options Exercised Repurchase of unvested founders shares, Value Stock Repurchased During Period Value Repurchase of unvested founders shares Stock Repurchased During Period Shares Vesting of restricted common stock issued to founders Adjustments To Additional Paid In Capital Vesting Of Restricted Stock Awards Stock-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Cumulative translation adjustment Distributions to non-controlling interest Minority Interest Decrease From Distributions To Noncontrolling Interest Holders Net loss Ending Balances Ending Balances, shares Ending Balances Ending Balances, shares Temporary equity conversion price per share. Temporary equity price per share for services. Issuance price per share of convertible preferred stock Shares Issued Price Per Share Stock issuance/ offering costs Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Conversion price per share of convertible preferred stock Temporary Equity Conversion Price Per Share Exchange price per share of convertible preferred stock for services Temporary Equity Price Per Share For Services Fair value of warrants in excess of debt proceeds recognized at issuance. Fair value of embedded derivatives in excess of debt proceeds recognized at issuance. The increase (decrease) during the reporting period in the aggregate amount of contingent liability under the collaborative arrangement. Stock issuance for acquisition. Noncash contingent consideration related to acquisition. The fair value of preferred stock warrants converted to preferred stock. Noncash vesting of restricted common stock. Purchase of equipment included in accounts payable . Initial public offering costs included in accounts payable. Accrued expenses settled with common stock warrants. Accrued expenses settled with preferred stock. 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) provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation Depletion And Amortization Remeasurement of contingent consideration Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 Remeasurement of convertible preferred stock warrant and embedded derivative liabilities Fair Value Adjustment Of Warrants Fair value of warrants in excess of debt proceeds recognized at issuance Fair Value Of Warrants In Excess Of Debt Proceeds Recognized At Issuance Fair value of embedded derivative in excess of debt proceeds recognized at issuance Fair Value Of Embedded Derivatives In Excess Of Debt Proceeds Recognized At Issuance Preferred stock issued in exchange for services Issuance Of Stock And Warrants For Services Or Claims Non-cash interest expense and amortization of debt discount Amortization Of Financing Costs And Discounts Gain on extinguishment of 2013 and 2011 Notes Gains Losses On Extinguishment Of Debt Stock-based compensation expense Share Based Compensation Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Receivables from collaboration and license agreement Increase Decrease In Accounts Receivable Notes receivable Increase Decrease In Notes Receivable Current Notes receivable from related parties Increase Decrease In Notes Receivable Related Parties Current Prepaid assets Increase Decrease In Prepaid Expense Other assets Increase Decrease In Other Current Assets Other assets - related party Increase Decrease In Due To Related Parties Other assets - non-current Increase Decrease In Other Noncurrent Assets Accounts payable Increase Decrease In Accounts Payable Accounts payable - related parties Increase Decrease In Accounts Payable Related Parties Accrued liabilities Increase Decrease In Accrued Liabilities Other liabilities Increase Decrease In Other Current Liabilities Deferred revenue Increase Decrease In Deferred Revenue Advance payments under license agreements with related party Increase Decrease In Due To Related Parties Current Contingent liability to collaborator Increase Decrease In Contingent Liability To Collaborator Other liabilities, non-current Increase Decrease In Other Noncurrent Liabilities Net cash (used in) provided by 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]