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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net loss $ (62,960) $ (34,693)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 632 554
Accretion of debt discount and amortization of debt issuance costs 701 574
Stock-based compensation expense 5,083 497
Provision for doubtful accounts receivable 348 209
Provision for excess and obsolete inventories 436 1,362
Noncash operating lease cost 569 563
Change in fair value of redeemable convertible preferred stock warrant 6,861 64
Loss on disposal of property and equipment 115 158
Proceeds from Paycheck Protection Program loan 0 (2,246)
Changes in operating assets and liabilities:    
Accounts receivable (3,694) (1,477)
Inventory (1,313) (1,716)
Prepaid expenses and other current assets (3,003) (735)
Other noncurrent assets 185 (237)
Accounts payable 1,168 448
Accrued compensation 1,918 1,900
Accrued and other current liabilities 342 1,987
Other noncurrent liabilities 72 614
Net cash used in operating activities (52,540) (32,174)
Cash flows from investing activities:    
Purchases of property and equipment (813) (953)
Net cash used in investing activities (813) (953)
Cash flows from financing activities:    
Proceeds from issuance of common stock upon initial public offering, net of underwriting discounts and commissions 256,680 0
Payment of other offering costs related to the initial public offering (4,506) (42)
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 0 53,075
Proceeds from the issuance of debt 0 20,480
Debt issuance costs 0 (142)
Proceeds from exercise of common stock warrants 0 6
Proceeds from exercise of common stock options 355 24
Net cash provided by financing activities 252,529 73,401
Net change in cash and cash equivalents 199,176 40,274
Cash and cash equivalents at beginning of period 61,511 21,237
Cash and cash equivalents at end of period 260,687 61,511
Supplemental disclosure of cash flow information    
Cash paid for interest 3,105 1,286
Supplemental disclosure of non-cash investing and financing information    
Acquisition of property and equipment included in accounts payable and accrued liabilities 162 41
Unpaid initial public offering costs in accounts payable and accrued liabilities 0
Common Stock issued on conversion of convertible preferred stock 117,331
Common stock warrants issued on conversion of preferred stock warrants and the reclassification of the warrant liability $ 8,973 $ 0