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 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 Deferred revenue related party. Deferred Rent And Other Liabilities Noncurrent Statement Of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Marketable securities Marketable Securities Current Accounts receivable, net of allowance of $0 and $171 at December 31, 2016 and 2015, respectively Accounts Receivable Net Current Receivable due from Roche Accounts Receivable Related Parties Current Inventory Inventory Net Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Marketable securities Marketable Securities Noncurrent Property and equipment, net Property Plant And Equipment Net Restricted cash Restricted Cash And Cash Equivalents Noncurrent 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 expenses and other current liabilities Accrued Liabilities Current Deferred revenue Deferred Revenue Current Roche related-party deferred revenue Deferred Revenue Related Party Current portion of deferred rent Deferred Rent Credit Current Total current liabilities Liabilities Current Deferred rent, net of current portion and other non-current liabilities Deferred Rent And Other Liabilities Noncurrent Commitments and contingencies (Note 12) Commitments And Contingencies Stockholders’ equity: Stockholders Equity [Abstract] Common stock, $0.0001 par value, 150,000,000 shares authorized; 35,281,001 and 34,513,845 shares issued and outstanding at December 31, 2016 and 2015, 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 stockholders’ equity Stockholders Equity Total liabilities and stockholders’ equity Liabilities And Stockholders Equity Allowance for accounts receivable Allowance For Doubtful Accounts Receivable Current 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] Revenue Sales Revenue Services Gross Related-party revenue from Roche Revenue From Related Parties Total revenue Revenues Costs and expenses: Costs And Expenses [Abstract] Cost of revenue Cost Of Revenue Cost of Roche related-party revenue Costs And Expenses Related Party Selling and marketing Selling And Marketing Expense General and administrative General And Administrative Expense Research and development Research And Development Expense Total costs and expenses Costs And Expenses Loss from operations Operating Income Loss Other income (expense): Nonoperating Income Expense [Abstract] Interest income (expense), net Interest Income Expense Nonoperating Net Other income (expense), net Other Nonoperating Income Expense Total other income (expense), net Nonoperating Income Expense Net loss Net Income Loss Other comprehensive gain/(loss): Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] Unrealized gain/(loss) on available-for-sale securities Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax Foreign currency translation adjustment Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Total other comprehensive gain/(loss) Other Comprehensive Income Loss Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax 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 Stock issued during period value of vesting of restricted shares. Stock issued during period shares vesting of restricted shares. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-In Capital [Member] Additional Paid In Capital [Member] Accumulated Other Comprehensive Loss [Member] Accumulated Other Comprehensive Income [Member] Accumulated Deficit [Member] Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Beginning Balance Beginning Balance, shares Shares Issued 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 Vesting of restricted stock Stock Issued During Period Value Of Vesting Of Restricted Shares Vesting of restricted stock, shares Stock Issued During Period Shares Vesting Of Restricted Shares Issuance of common stock from Roche transaction, net of issuance costs Stock Issued During Period Value New Issues Issuance of common stock from Roche transaction, net of issuance costs, Shares Stock Issued During Period Shares New Issues Stock-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Other comprehensive loss Net loss Ending Balance Ending Balance, shares Purchased premium and interest on available for sale securities. Increase decrease in deferred revenue related parties. Statement Of Cash Flows [Abstract] Related Party Transaction Related Party Transaction [Axis] Related Party Transaction Related Party Transaction [Domain] Roche. Roche [Member] Roche [Member] Operating activities Net Cash Provided By Used In Operating Activities Continuing Operations [Abstract] Adjustments to reconcile net loss to cash used in operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization expense Depreciation And Amortization Stock-based compensation Allocated Share Based Compensation Expense Provision for doubtful accounts on accounts receivable Provision For Doubtful Accounts Purchased premiums and interest on marketable securities Purchased Premium And Interest On Available For Sale Securities Non-cash interest expense Paid In Kind Interest Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable Increase Decrease In Accounts Receivable Receivable from Roche Increase Decrease In Accounts Receivable Related Parties Inventory Increase Decrease In Inventories Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Other assets Increase Decrease In Other Operating Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses and other current liabilities Increase Decrease In Accrued Liabilities Deferred rent and other non-current liabilities Straight Line Rent Deferred revenue Increase Decrease In Deferred Revenue Roche related-party deferred revenue Increase Decrease In Deferred Revenue Related Parties 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] Purchases of property and equipment Payments To Acquire Property Plant And Equipment Purchases of marketable securities and other investments Payments To Acquire Marketable Securities Proceeds from maturities of marketable securities Proceeds From Sale And Maturity Of Marketable Securities Change in restricted cash Increase Decrease In Restricted Cash Net cash provided by (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 common stock, net of issuance costs Proceeds From Issuance Of Common Stock Proceeds from issuance of restricted stock and stock option exercises Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options Payment of debt issuance costs Payments Of Debt Issuance Costs Payments of notes payable Repayments Of Notes Payable Net cash provided by (used in) 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 Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Supplemental disclosure of non-cash investing and financing activities Cash Flow Noncash Investing And Financing Activities Disclosure [Abstract] Acquisition of property and equipment included in accounts payable and accrued expenses Capital Expenditures Incurred But Not Yet Paid Organization Consolidation And Presentation Of Financial Statements [Abstract] Nature of Business Nature Of Operations Accounting Policies [Abstract] Summary of Significant Accounting Policies and Basis of Presentation Significant Accounting Policies [Text Block] Significant Agreements Collaborative Arrangement Disclosure [Text Block] Investments Debt And Equity Securities [Abstract] Marketable Securities Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosure [Text Block] Property Plant And Equipment [Abstract] Property and Equipment Property Plant And Equipment Disclosure [Text Block] Payables And Accruals [Abstract] Accrued Expenses and Other Current Liabilities Accounts Payable Accrued Liabilities And Other Liabilities Disclosure Current [Text Block] Debt Disclosure [Abstract] Notes Payable and Debt Debt Disclosure [Text Block] Earnings Per Share [Abstract] Net Loss Per Common Share Earnings Per Share [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Equity [Abstract] Stockholders' Equity Shareholders Equity And Share Based Payments [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] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Quarterly Financial Information Disclosure [Abstract] Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of accounting and consolidation. Basis of Presentation and Consolidation Basis Of Accounting And Consolidation Policy [Text Block] Use of Estimates Use Of Estimates Off-Balance Sheet Risk and Concentrations of Credit Risk Concentration Risk Credit Risk Segment Information Segment Reporting Policy Policy [Text Block] Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Marketable Securities Marketable Securities Policy Accounts Receivable and Allowance for Doubtful Accounts Receivables Trade And Other Accounts Receivable Allowance For Doubtful Accounts Policy Inventory Inventory Policy [Text Block] Property and Equipment Property Plant And Equipment Policy [Text Block] Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Fair Value of Financial Instruments Fair Value Of Financial Instruments Policy Revenue Recognition Revenue Recognition Policy [Text Block] Research and Development Expenses Research And Development Expense Policy Stock-Based Compensation Share Based Compensation Option And Incentive Plans Policy Income Taxes Income Tax Policy [Text Block] Net Loss Per Share Earnings Per Share Policy [Text Block] Comprehensive Loss Comprehensive Income Policy Policy [Text Block] New accounting standards. Application of New or Revised Accounting Standards New Accounting Standards Policy [Text Block] Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Subsequent Events Subsequent Events Policy Policy [Text Block] Summary of Inventory Schedule Of Inventory Current Table [Text Block] Schedule of property plant and equipment estimated useful life. Summary of Estimated Useful Lives Schedule Of Property Plant And Equipment Estimated Useful Life Table [Text Block] Summary of Available for Sale Securities Held Schedule Of Available For Sale Securities Reconciliation Table [Text Block] Estimated Market Value of Marketable Securities by Maturity Investments Classified By Contractual Maturity Date Table [Text Block] Property and Equipment and Related Accumulated Depreciation and Amortization Property Plant And Equipment [Text Block] Summary of Accrued Expenses Schedule Of Accounts Payable And Accrued Liabilities Table [Text Block] Potential Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Common Share Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Text Block] Summary of Company's Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Schedule of common stock reserved for future issuance. Schedule of Number of Shares of Common Stock Reserved for Future Issuance Schedule Of Common Stock Reserved For Future Issuance Table [Text Block] Summary of Roll Forward of Restricted Stock Activity Pursuant to the 2010 and 2013 Stock Plan Schedule Of Unvested Restricted Stock Units Roll Forward Table [Text Block] Summary of Stock Option Activity Under the 2010 Stock Plan and the 2013 Stock Plan Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Recorded Stock-Based Compensation Expense in the Consolidated Statements of Operations and Comprehensive Loss Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block]