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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities    
Net loss $ (21,891) $ (26,756)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 7,679 7,201
Depreciation 159 132
Amortization of debt discount and issuance costs 179 207
Non-cash interest expense 743 775
PIK interest incurred but not paid on term loan 1,389 1,994
Amortization of right-of-use asset 1,159 1,064
(Gain) loss on short-term investments (315) 580
Inventory write-downs 196 132
Changes in operating assets and liabilities    
Accounts receivable 753 (3,798)
Inventory (1,066) (179)
Prepaid expenses and other assets 621 1,530
Accounts payable (102) (815)
Accrued liabilities (1,108) 2,623
Deferred revenue (341) 0
Operating lease liabilities (1,207) (1,050)
Net cash used in operating activities (13,152) (16,360)
Cash flows from investing activities    
Acquisition of property and equipment (267) (141)
Proceeds from sale of short-term investments 7,300 19,700
Net cash provided by investing activities 7,033 19,559
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 1,336 254
Taxes withheld and paid related to net share settlement of equity awards (789) (222)
Proceeds from at-the-market offering, net of sales commission 2,932 0
Payment of deferred offering costs 0 (119)
Net cash provided by (used in) financing activities 3,479 (87)
Net (decrease) increase in cash and cash equivalents (2,640) 3,112
Cash, cash equivalents and restricted cash    
Beginning of the period 18,180 6,727
End of the period 15,540 9,839
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 15,418 9,717
Restricted cash 122 122
Cash, cash equivalents and restricted cash in balance sheets 15,540 9,839
Supplemental disclosure of cash flow information:    
Cash paid for interest 4,294 3,305
Supplemental disclosures of non-cash investing and financing information:    
Deferred offering costs offset against additional paid-in capital 99 0
Net change in accrued liabilities from early exercise of options $ (1) $ (1)