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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities    
Net loss $ (23,263) $ (12,240)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 179 135
Accretion of debt discount and amortization of debt issuance costs 161 170
Stock-based compensation expense 2,974 277
Provision for doubtful accounts receivable (60) 27
Provision for excess and obsolete inventories 8 211
Noncash operating lease expense 121 156
Change in fair value of redeemable convertible preferred stock warrant 0 (555)
Loss on disposal of property and equipment 46 4
Changes in operating assets and liabilities:    
Accounts receivable (1,180) (301)
Inventory (615) (146)
Prepaid expenses and other current assets 1,472 122
Other noncurrent assets 10 (1,024)
Accounts payable (248) 1,071
Accrued compensation (2,129) (1,845)
Accrued and other current liabilities 472 977
Other noncurrent liabilities 86 91
Net cash used in operating activities (21,966) (12,870)
Cash flows from investing activities    
Purchases of property and equipment (227) (104)
Net cash used in investing activities (227) (104)
Cash flows from financing activities    
Payments of costs related to initial public offering 0 (223)
Proceeds from exercise of common stock options 92 13
Net cash provided by (used in) financing activities 92 (210)
Net change in cash and cash equivalents (22,101) (13,184)
Cash and cash equivalents at beginning of period 260,687 61,511
Cash and cash equivalents at end of period 238,586 48,327
Supplemental disclosure of cash flow information    
Cash paid for interest 766 766
Supplemental noncash disclosure    
Acquisition of property and equipment included in accounts payable and accrued liabilities 418 35
Unpaid initial public offering costs in accounts payable and accrued liabilities $ 0 $ 1,017