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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities    
Net loss $ (12,140) $ (18,134)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 536 817
Change in allowance for doubtful accounts (3) 8
Stock-based compensation 1,081 1,038
Change in fair value of redeemable convertible preferred stock warrants 681 (235)
Loss on write-off of property and equipment 95 172
Amortization of debt discount 194 235
Write-off of public offering costs 0 1,292
Forgiveness of notes receivable 0 437
Changes in operating assets and liabilities    
Accounts receivable 357 (405)
Inventory (458) (1,146)
Prepaid expenses and other assets 495 (43)
Accounts payable (884) 1,447
Accrued liabilities and other 1,844 1,023
Net cash used in operating activities (8,202) (13,494)
Cash flows from investing activities    
Purchase of property and equipment (777) (370)
Net cash used in investing activities (777) (370)
Cash flows from financing activities    
Proceeds from the exercise of common stock options, net 915 176
Proceeds from the issuance of redeemable convertible preferred stock, net 0 5,426
Payments of public offering costs (288) (1,292)
Net cash provided by financing activities 627 4,310
Effect of exchange rate changes on cash and cash equivalents (52) 154
Net decrease in cash and cash equivalents (8,404) (9,400)
Cash and cash equivalents at    
Beginning of period 22,408 27,900
End of period 14,004 18,500
Supplemental disclosure of cash flow information    
Cash paid for interest 3,147 2,473
Supplemental disclosure of noncash information    
Vesting of early exercised stock options 64 91
Purchases of property and equipment included in accounts payable and accrued liabilities 35 10
Public offering costs included in accounts payable and accrued liabilities $ 865 $ 0