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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities    
Net loss $ (26,756) $ (35,936)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 7,201 6,273
Depreciation 132 213
Amortization of debt discount and issuance costs 207 192
Non-cash interest expense 775 636
PIK interest incurred but not paid on term loan 1,994 1,279
Amortization of right-of-use asset 1,064 2,022
Loss on short-term investments 580 210
Inventory write-downs 132 204
Changes in operating assets and liabilities    
Accounts receivable (3,798) (783)
Inventory (179) (964)
Prepaid expenses and other assets 1,530 (181)
Accounts payable (815) (208)
Accrued liabilities 2,623 121
Operating lease liabilities (1,050) (2,104)
Net cash (used in) operating activities (16,360) (29,026)
Cash flows from investing activities    
Acquisition of property and equipment (141) (501)
Proceeds from sale of short-term investments 19,700 15,400
Net cash provided by investing activities 19,559 14,899
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 254 683
Taxes withheld and paid related to net share settlement of equity awards (222) (55)
Payment of deferred offering costs (119) 0
Net cash (used in) provided by financing activities (87) 628
Net increase (decrease) in cash and cash equivalents 3,112 (13,499)
Cash, cash equivalents and restricted cash    
Beginning of the period 6,727 19,309
End of the period 9,839 5,810
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 9,717 5,688
Restricted cash 122 122
Cash, cash equivalents and restricted cash in balance sheets 9,839 5,810
Supplemental disclosure of cash flow information:    
Cash paid for interest 3,305 3,481
Supplemental disclosures of non-cash investing and financing information:    
Operating lease right-of-use asset obtained in exchange for lease obligations 0 10,585
Net change in accrued liabilities from early exercise of options (1) (3)
Purchase of property and equipment included in accounts payable $ 0 $ 4