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Condensed Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities    
Net loss $ (11,461) $ (8,810)
Adjustments to reconcile net loss to net cash used in operating activities    
Stock-based compensation expense 1,488 202
Depreciation 80 74
Amortization of debt discount and issuance costs 67 69
Non-cash interest expense 201 217
Amortization of right-of-use asset 672 0
Inventory write-downs 82 24
Change in fair value of redeemable convertible preferred stock warrant liability 0 3,122
Changes in operating assets and liabilities    
Accounts receivable (1,970) 194
Inventory (362) (157)
Prepaid expenses and other assets 239 (135)
Accounts payable 820 536
Accrued liabilities (472) (1,094)
Operating lease liabilities (777) 0
Deferred rent 0 (178)
Net cash (used in) operating activities (11,393) (5,936)
Cash flows from investing activities    
Acquisition of property and equipment (306) (35)
Purchase of short-term investments 0 (5,000)
Net cash (used in) investing activities (306) (5,035)
Cash flows from financing activities    
Issuance of common stock pursuant to stock option exercises 1 4
Payment of deferred offering costs 0 (1,582)
Net cash provided by (used in) financing activities 1 (1,578)
Net decrease in cash and cash equivalents (11,698) (12,549)
Cash, cash equivalents and restricted cash    
Beginning of the period 19,309 26,756
End of the period 7,611 14,207
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 7,489 13,841
Restricted cash 122 366
Cash, cash equivalents and restricted cash in balance sheets 7,611 14,207
Supplemental disclosure of cash flow information:    
Cash paid for interest 1,563 1,563
Supplemental disclosures of non-cash investing and financing information:    
Net change in accrued liabilities from early exercise of options (2) 0
Purchase of property and equipment included in accounts payable 31 0
Unpaid deferred offering costs included in accounts payable and accrued liabilities $ 0 $ 578