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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash flows from operating activities    
Net loss $ (27,141) $ (32,956)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 10,282 9,558
Depreciation 207 172
Amortization of debt discount and issuance costs 228 283
Non-cash interest expense 954 1,075
PIK interest incurred but not paid on term loan 1,389 2,683
Amortization of right-of-use asset 1,562 1,433
(Gain) loss on short-term investments (229) 315
Inventory write-downs 251 196
Other 1 24
Changes in operating assets and liabilities    
Accounts receivable (537) (4,850)
Inventory (2,418) (1,698)
Prepaid expenses and other assets 384 381
Accounts payable 671 240
Accrued liabilities (1,392) 3,768
Deferred revenue (534) 1,090
Operating lease liabilities (1,627) (1,415)
Net cash used in operating activities (17,949) (19,701)
Cash flows from investing activities    
Acquisition of property and equipment (306) (173)
Proceeds from sale of short-term investments 9,300 23,200
Net cash provided by investing activities 8,994 23,027
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 1,931 803
Taxes withheld and paid related to net share settlement of equity awards (881) (259)
Proceeds from At-the-Market offering, net of sales commission 3,277 7,888
Payment of deferred offering costs 0 (305)
Net cash provided by financing activities 4,327 8,127
Net (decrease) increase in cash and cash equivalents (4,628) 11,453
Cash, cash equivalents and restricted cash    
Beginning of year 18,180 6,727
End of year 13,552 18,180
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 13,430 18,058
Restricted cash 122 122
Total cash, cash equivalents and restricted cash 13,552 18,180
Supplemental disclosure of cash flow information:    
Cash paid for interest 6,226 4,476
Supplemental disclosures of non-cash investing and financing information:    
Net change in accrued liabilities from early exercise of options (1) (1)
Purchase of property and equipment included in accounts payable 19 69
Deferred offering costs offset against additional paid-in capital $ 110 $ 265