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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities    
Net Loss $ (18,271) $ (14,637)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,103 646
Stock-based compensation 7,024 1,251
Amortization of debt discount and issuance costs 197 284
Amortization of premiums (accretion of discounts) on investments, net (207)  
Non-cash interest expense 1,152 1,099
Provision for bad debt and contractual allowance 5,927 3,384
Change in fair value of preferred stock warrant liabilities   996
Changes in operating assets and liabilities:    
Accounts receivable (8,560) (7,115)
Inventory 76 (527)
Prepaid expenses and other current assets (197) (301)
Other assets (793) (842)
Accounts payable (33) 69
Accrued liabilities 1,294 (363)
Deferred revenue (43) 344
Deferred rent 143 (1)
Net cash used in operating activities (11,188) (15,713)
Cash flows from investing activities    
Change in restricted cash 91  
Purchases of property and equipment (2,651) (1,821)
Purchases of available-for-sale investments (90,243)  
Maturities of available-for-sale investments 68,682  
Net cash used in investing activities (24,121) (1,821)
Cash flows from financing activities    
Net proceeds from employee stock transactions 4,095 82
Payments of deferred issuance costs   (1,995)
Net cash provided by (used in) financing activities 4,095 (1,913)
Net decrease in cash and cash equivalents (31,214) (19,447)
Cash and cash equivalents, beginning of period 51,643 25,208
Cash and cash equivalents, end of period 20,429 5,761
Supplemental disclosures of cash flow information    
Interest paid 1,152 1,213
Non-cash investing and financing activities    
Deferred offering costs included in accounts payable and accrued liabilities   637
Property, plant and equipment costs included in accounts payable $ 6 $ 152