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Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities    
Net loss $ (47,082) $ (36,080)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 8,349 4,288
Depreciation 267 296
Amortization of debt discount and issuance costs 258 267
Non-cash interest expense 874 806
PIK interest incurred but not paid on term loan 1,934 0
Amortization of right-of-use asset 2,720 0
Inventory write-downs 243 242
Realized loss from sale of short-term investments 356 0
Change in fair value of redeemable convertible preferred stock warrant liability 0 5,236
Changes in operating assets and liabilities    
Accounts receivable (391) 1,304
Inventory (2,133) (1,156)
Prepaid expenses and other assets (792) (1,164)
Accounts payable 647 479
Accrued liabilities (15) 1,719
Operating lease liabilities (2,104) 0
Other liabilities 0 (248)
Deferred rent 0 (566)
Net cash used in operating activities (36,869) (24,577)
Cash flows from investing activities    
Acquisition of property and equipment (603) (384)
Proceeds from sale of short-term investments 24,400 0
Purchase of short-term investments 0 (85,012)
Net cash provided by (used in) investing activities 23,797 (85,396)
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 896 919
Taxes withheld and paid related to net share settlement of equity awards (59) 0
Proceeds from issuance of common stock in initial public offering, net of underwriter discount and commissions 0 109,089
Payment of deferred offering costs (347) (3,392)
Repayment of debt 0 (4,090)
Net cash provided by financing activities 490 102,526
Net decrease in cash and cash equivalents (12,582) (7,447)
Cash, cash equivalents and restricted cash    
Beginning of year 19,309 26,756
End of year 6,727 19,309
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 6,605 19,187
Restricted cash 122 122
Total cash, cash equivalents and restricted cash 6,727 19,309
Supplemental disclosure of cash flow information:    
Cash paid for interest 4,464 6,337
Supplemental disclosures of non-cash investing and financing information:    
Operating lease right-of-use asset obtained in exchange for lease obligations 10,700 0
Net change in accrued liabilities from early exercise of options (4) 2
Purchase of property and equipment included in accounts payable $ 124 $ 0