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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities    
Net loss $ (32,956) $ (47,082)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 9,558 8,349
Depreciation 172 267
Amortization of debt discount and issuance costs 283 258
Non-cash interest expense 1,075 874
PIK interest incurred but not paid on term loan 2,683 1,934
Amortization of right-of-use asset 1,433 2,720
Loss on short-term investments 315 356
Inventory write-downs 196 243
Other 24 0
Changes in operating assets and liabilities    
Accounts receivable (4,850) (391)
Inventory (1,698) (2,133)
Prepaid expenses and other assets 381 (792)
Accounts payable 240 647
Accrued liabilities 3,768 (15)
Deferred revenue 1,090 0
Operating lease liabilities (1,415) (2,104)
Net cash used in operating activities (19,701) (36,869)
Cash flows from investing activities    
Acquisition of property and equipment (173) (603)
Proceeds from sale of short-term investments 23,200 24,400
Net cash provided by investing activities 23,027 23,797
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 803 896
Taxes withheld and paid related to net share settlement of equity awards (259) (59)
Proceeds from at-the-market offering, net of issuance costs 7,888 0
Payment of deferred offering costs (305) (347)
Net cash provided by financing activities 8,127 490
Net increase (decrease) in cash and cash equivalents 11,453 (12,582)
Cash, cash equivalents and restricted cash    
Beginning of year 6,727 19,309
End of year 18,180 6,727
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 18,058 6,605
Restricted cash 122 122
Total cash, cash equivalents and restricted cash 18,180 6,727
Supplemental disclosure of cash flow information:    
Cash paid for interest 4,476 4,464
Supplemental disclosures of non-cash investing and financing information:    
Operating lease right-of-use asset obtained in exchange for lease obligations 0 10,700
Net change in accrued liabilities from early exercise of options (1) (4)
Purchase of property and equipment included in accounts payable 69 124
Deferred offering costs offset against additional paid-in capital $ 265 $ 0