Entity Central Index Key Document And Entity Information [Abstract] 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 Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Deferred rent and asset retirement obligation long term. Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Series seed preferred stock. Convertible Preferred Stock, Series Seed Series Seed Preferred Stock [Member] Convertible Preferred Stock, Series A Series A Preferred Stock [Member] Convertible Preferred Stock, Series B Series B Preferred Stock [Member] Convertible Preferred Stock, Series C Series C 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 Short-term investments Short Term Investments Restricted cash Restricted Cash And Cash Equivalents At Carrying Value Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Restricted cash - long-term Restricted Cash And Cash Equivalents Noncurrent Property and equipment, net Property Plant And Equipment Net Goodwill Goodwill Intangible assets Intangible Assets Net Excluding Goodwill Other assets Other Assets Noncurrent Total assets Assets Liabilities and Stockholders' Equity Liabilities And Stockholders Equity [Abstract] Current liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued liabilities Accrued Liabilities Current Deferred rent Deferred Rent Credit Current Total current liabilities Liabilities Current Deferred rent and asset retirement obligation - long-term Deferred Rent And Asset Retirement Obligation Long Term Contingent acquisition consideration payable Business Combination Contingent Consideration Liability Noncurrent Deferred tax liability, net Deferred Tax Liabilities Noncurrent Total liabilities Liabilities Stockholders' equity: Stockholders Equity [Abstract] Preferred stock Preferred Stock Value Common stock, $0.00001 par value, 300,000,000 and 50,000,000 shares authorized as of December 31, 2016 and December 31, 2015; 21,731,259 and 2,106,152 shares issued and outstanding as of December 31, 2016 and December 31, 2015, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Accumulated deficit Retained Earnings Accumulated Deficit Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Total stockholders' equity Stockholders Equity Total liabilities and stockholders' equity Liabilities And Stockholders Equity 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 Preferred stock, aggregate liquidation preference Preferred Stock Liquidation Preference Value 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 Other comprehensive income loss on short term investment net of tax. Income Statement [Abstract] Operating expenses: Operating Expenses [Abstract] Research and development Research And Development Expense General and administrative General And Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income Loss Interest income Investment Income Interest Other (expense) income, net Other Nonoperating Income Expense Net loss Net Income Loss Unrealized losses on short-term investments Other Comprehensive Income Loss On Short Term Investment Net Of Tax Net loss and comprehensive loss Comprehensive Income Net Of Tax Net loss per share, basic and diluted Earnings Per Share Basic And Diluted Weighted-average number of shares used in computing net loss per share, basic and diluted Weighted Average Number Of Share Outstanding Basic And Diluted Preferred stock issued during period value acquisitions. Preferred stock issued during period shares acquisitions. Preferred stock conversion to common stock. Preferred stock conversion to common stock, shares. 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 Deficit Retained Earnings [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income [Member] Research and Development Arrangement, Contract to Perform for Others, Type Research And Development Arrangement Contract To Perform For Others By Type [Axis] Research and Development Arrangement, Contract to Perform for Others, Type Research And Development Arrangement Contract To Perform For Others Type [Domain] Genethon collaborative development agreement. Genethon Genethon Collaborative Development Agreement [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Initial Public Offering I P O [Member] Balance Balance (in shares) Shares Outstanding Issuance of common stock Stock Issued During Period Value New Issues Issuance of common stock, shares Stock Issued During Period Shares New Issues Issuance of common stock for acquisition of business Stock Issued During Period Value Acquisitions Issuance of common stock for acquisition of business, shares Stock Issued During Period Shares Acquisitions Exercise of stock options Stock Issued During Period Value Stock Options Exercised Exercise of stock options, shares Stock Issued During Period Shares Stock Options Exercised Issuance of Series B convertible preferred stock, for acquisition of business Preferred Stock Issued During Period Value Acquisitions Issuance of Series B convertible preferred stock, for acquisition of business, shares Preferred Stock Issued During Period Shares Acquisitions Issuance of convertible preferred stock, net in issuance costs Stock Issued During Period Value Conversion Of Convertible Securities Issuance of convertible preferred stock, net in issuance costs, shares Stock Issued During Period Shares Conversion Of Convertible Securities Stock-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Preferred stock conversion to common stock Preferred Stock Conversion To Common Stock Preferred stock conversion to common stock, shares Preferred Stock Conversion To Common Stock Shares Net loss Other comprehensive loss Other Comprehensive Income Loss Net Of Tax Balance Balance (in shares) Net issuance costs Adjustments To Additional Paid In Capital Stock Issued Issuance Costs Non cash deferred finance costs related to initial public offering. Payments for (proceeds from) preferred stock issuance costs. Issuance of common stock in exchange for license. Statement Of Cash Flows [Abstract] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Cardiogen Sciences Inc. Cardiogen Sciences, Inc Cardiogen Sciences Inc [Member] Cash flows from 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 Noncash Items To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Amortization of discount on investments Investment Income Net Amortization Of Discount And Premium Depreciation and amortization Depreciation And Amortization Stock-based compensation Share Based Compensation Accretion of asset retirement obligation Asset Retirement Obligation Accretion Expense Change in fair value of contingent acquisition consideration payable Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 Other Other Noncash Income Expense Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Additions to restricted cash Increase Decrease In Restricted Cash Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Other assets Increase Decrease In Other Noncurrent Assets Accounts payable Increase Decrease In Accounts Payable Accrued liabilities Increase Decrease In Accrued Liabilities Deferred rent Straight Line Rent Net cash used in operating activities Net Cash Provided By Used In Operating Activities Continuing Operations Cash flows from investing activities: Net Cash Provided By Used In Investing Activities Continuing Operations [Abstract] Cash acquired from acquisition Cash Acquired From Acquisition Proceeds from sales of property and equipment Proceeds From Sale Of Property Plant And Equipment Purchases of property and equipment Payments To Acquire Property Plant And Equipment Proceeds from sales and maturities of marketable securities Proceeds From Sale And Maturity Of Marketable Securities Purchases of marketable securities Payments To Acquire Marketable Securities Net cash used in investing activities Net Cash Provided By Used In Investing Activities Continuing Operations Cash flows from financing activities: Net Cash Provided By Used In Financing Activities Continuing Operations [Abstract] Proceeds from exercise of stock options Proceeds From Stock Options Exercised Proceeds from issuance of common stock from initial public offering, net of offering costs Proceeds From Issuance Initial Public Offering Proceeds from issuance of convertible preferred stock, net of issuance costs Proceeds From Issuance Of Convertible Preferred Stock Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Continuing Operations Net (decrease) increase in cash and cash equivalents Cash And Cash Equivalents Period Increase Decrease Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Noncash investing and financing activities: Noncash Investing And Financing Items [Abstract] Change in accounts payable, accrued liabilities and facility lease obligations related to property and equipment purchases Capital Expenditures Incurred But Not Yet Paid Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering Conversion Of Stock Amount Converted1 Deferred financing costs for initial public offering Non Cash Deferred Finance Costs Related To Initial Public Offering Net assets acquired and stock issued for the Cardiogen acquisition Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 Preferred stock issuance costs Payments For Proceeds From Preferred Stock Issuance Costs Issuance of common stock in exchange for license Issuance Of Common Stock In Exchange For License Organization Consolidation And Presentation Of Financial Statements [Abstract] Description of Business Business Description And Basis Of Presentation [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Cash Cash Equivalents And Short Term Investments [Abstract] Cash Equivalents and Short-Term Investments Cash Cash Equivalents And Short Term Investments [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Disclosure Text Block Supplement [Abstract] Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Business Combinations [Abstract] Business Combinations Business Combination Disclosure [Text Block] License and collaboration agreements disclosure. License and Collaboration Agreements License And Collaboration Agreements Disclosure [Text Block] Stockholders Equity Note [Abstract] Stockholders’ Equity Stockholders Equity Note Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Earnings Per Share [Abstract] Net Loss Per Share Earnings Per Share [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Quarterly Financial Information Disclosure [Abstract] Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Use of Estimates Use Of Estimates Financial Instruments Fair Value Of Financial Instruments Policy Fair Value Measurements Fair Value Measurement Policy Policy [Text Block] Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Concentration of Credit Risk Concentration Risk Credit Risk Concentration of manufacturing and third party services risk. Concentration of Manufacturing and Third-Party Services Risk Concentration Of Manufacturing And Third Party Services Risk Policy [Text Block] Property and Equipment Property Plant And Equipment Policy [Text Block] Impairment of Long-Lived Assets Impairment Or Disposal Of Long Lived Assets Including Intangible Assets Policy Policy [Text Block] Business Combinations Business Combinations Policy Contingent acquisition consideration payable. Contingent Consideration Payable Contingent Acquisition Consideration Payable Policy Policy [Text Block] Accrued research and development costs. Accrued Research and Development Costs Accrued Research And Development Costs Policy [Text Block] Research and Development Costs Research And Development Expense Policy Facility Lease Obligations Lease Policy [Text Block] Stock-Based Compensation Compensation Related Costs Policy [Text Block] Income Taxes Income Tax Policy [Text Block] Net Loss per Share Earnings Per Share Policy [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Schedule of estimated useful lives of property and equipment Summary of Estimated Useful Lives of Property and Equipment Schedule Of Estimated Useful Lives Of Property And Equipment Table [Text Block] Schedule of Fair Value and Amortized Cost of Cash Equivalents and Short-term Investments Schedule Of Unrealized Loss On Investments Table [Text Block] Schedule of Investments' Gross Unrealized Loss and Fair Value, Aggregated by Investment Category Available For Sale Securities Continuous Unrealized Loss Position Fair Value Table [Text Block] Fair Value of Financial Assets Fair Value Assets Measured On Recurring And Nonrecurring Basis Table [Text Block]