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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities    
Net loss $ (35,936) $ (25,387)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 6,273 2,412
Depreciation 213 217
Amortization of debt discount and issuance costs 192 200
Non-cash interest expense 636 608
PIK interest incurred but not paid on term loan 1,279 0
Amortization of right-of-use asset 2,022 0
Realized loss from sale of short-term investments 210 0
Inventory write-downs 204 185
Change in fair value of redeemable convertible preferred stock warrant liability 0 5,236
Changes in operating assets and liabilities    
Accounts receivable (783) 1,784
Inventory (964) (438)
Prepaid expenses and other assets (181) (2,227)
Accounts payable (208) 259
Accrued liabilities 121 1,296
Operating lease liabilities (2,104) 0
Deferred rent 0 (519)
Net cash (used in) operating activities (29,026) (16,374)
Cash flows from investing activities    
Acquisition of property and equipment (501) (230)
Proceeds from sale of short-term investments 15,400 0
Purchase of short-term investments 0 (85,012)
Net cash provided by (used in) investing activities 14,899 (85,242)
Cash flows from financing activities    
Proceeds from issuance of common stock under employee plans 683 8
Taxes withheld and paid related to net share settlement of equity awards (55) 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 0 (3,392)
Repayment of debt 0 (4,090)
Net cash provided by financing activities 628 101,615
Net (decrease) in cash and cash equivalents (13,499) (1)
Cash, cash equivalents and restricted cash    
Beginning of the period 19,309 26,756
End of the period 5,810 26,755
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 5,688 26,633
Restricted cash 122 122
Cash, cash equivalents and restricted cash in balance sheets 5,810 26,755
Supplemental disclosure of cash flow information:    
Cash paid for interest 3,481 4,740
Supplemental disclosures of non-cash investing and financing information:    
Operating lease right-of-use asset obtained in exchange for lease obligations 10,585 0
Net change in accrued liabilities from early exercise of options (3) 4
Purchase of property and equipment included in accounts payable $ 4 $ 97