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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities    
Net loss $ (47,106) $ (29,855)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 375 289
Accretion of debt discount and amortization of debt issuance costs 328 346
Stock-based compensation expense 6,506 1,208
Provision for doubtful accounts receivable 105 104
Provision for excess and obsolete inventories 118 276
Noncash operating lease expense 246 310
Change in fair value of redeemable convertible preferred stock warrant 0 4,872
Loss on disposal of property and equipment 49 74
Changes in operating assets and liabilities:    
Accounts receivable (1,870) (1,628)
Inventory (1,583) (255)
Prepaid expenses and other current assets 2,129 (1,197)
Other noncurrent assets (34) (3,081)
Accounts payable (608) 1,438
Accrued compensation 299 13
Accrued and other current liabilities 599 1,594
Other noncurrent liabilities 176 186
Net cash used in operating activities (40,271) (25,306)
Cash flows from investing activities    
Purchases of property and equipment (569) (369)
Net cash used in investing activities (569) (369)
Cash flows from financing activities    
Payments of costs related to initial public offering 0 (471)
Proceeds from exercise of common stock options 250 207
Net cash provided by (used in) financing activities 250 (264)
Net change in cash and cash equivalents (40,590) (25,939)
Cash and cash equivalents at beginning of period 260,687 61,511
Cash and cash equivalents at end of period 220,097 35,572
Supplemental disclosure of cash flow information    
Cash paid for interest 1,548 1,548
Supplemental noncash disclosure    
Acquisition of property and equipment included in accounts payable and accrued liabilities 279 181
Unpaid initial public offering costs in accounts payable and accrued liabilities $ 0 $ 2,764