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Condensed Statements of Cash Flows (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flows from operating activities    
Net loss $ (8,925) $ (10,375)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 2,540 2,125
Depreciation 45 48
Amortization of debt discount and issuance costs 78 64
Non-cash interest expense 316 234
PIK interest incurred but not paid on term loan 690 649
Amortization of right-of-use asset 378 347
(Gain) loss on short-term investments (51) 817
Inventory write-downs 47 34
Changes in operating assets and liabilities    
Accounts receivable 682 (1,713)
Inventory (249) (1,072)
Prepaid expenses and other assets 475 514
Accounts payable 950 (193)
Accrued liabilities (3,890) (834)
Deferred revenue (220) 0
Operating lease liabilities (394) (343)
Net cash (used in) operating activities (7,528) (9,698)
Cash flows from investing activities    
Acquisition of property and equipment (104) (132)
Proceeds from sale of short-term investments 2,500 10,200
Net cash provided by investing activities 2,396 10,068
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 721 1
Taxes withheld and paid related to net share settlement of equity awards (649) (146)
Payment of deferred offering costs 0 (110)
Net cash provided by (used in) financing activities 72 (255)
Net (decrease) increase in cash and cash equivalents (5,060) 115
Cash, cash equivalents and restricted cash    
Beginning of the period 18,180 6,727
End of the period 13,120 6,842
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 12,998 6,720
Restricted cash 122 122
Cash, cash equivalents and restricted cash in balance sheets 13,120 6,842
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,174 1,018
Supplemental disclosures of non-cash investing and financing information:    
Purchase of property and equipment included in accounts payable $ 55 $ 0