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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:    
Net loss $ (59,853) $ (53,019)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 3,324 2,860
Stock-based compensation expense 3,796 2,173
Change in fair value of redeemable convertible preferred stock warrants and derivative liability (199) 114
Non-cash lease adjustment (345) (157)
Inventory write-down 650 109
Other non-cash expense 0 60
Changes in operating assets and liabilities:    
Accounts receivable, net (2,914) (511)
Inventory (6,124) (3,105)
Prepaid expenses and other current assets (2,631) (339)
Accounts payable 812 (205)
Accrued compensation 1,834 2,302
Accrued interest expense 1,045 1,049
Deferred revenue 792 127
Other liabilities 2,479 199
Net cash used in operating activities (57,334) (48,343)
Cash flows from investing activities:    
Purchases of property and equipment (592) (233)
Net cash (used in) provided by investing activities (592) (233)
Cash flows from financing activities:    
Proceeds from issuance of common stock from the exercise of stock options 4,184 2,288
Proceeds from issuance of common stock from the initial public offering, net of underwriting discounts, commissions and offering expenses 172,364 0
Proceeds from issuance of note payable, net of issuance costs 0 24,685
Proceeds from the exercise of redeemable convertible preferred stock warrants 858 3,310
Net cash provided by financing activities 262,116 106,771
Net increase in cash, cash equivalents and restricted cash 204,190 58,195
Cash, cash equivalents, and restricted cash - Beginning of period 100,907 42,712
Cash, cash equivalents, and restricted cash - End of period 305,097 100,907
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 304,320 100,130
Restricted cash 777 777
Cash, cash equivalents and restricted cash in balance sheets 305,097 100,907
Supplemental cash flow information    
Interest paid 4,750 3,969
Non-cash investing and financing activities    
Transfer of evaluation units from inventory to property and equipment, net (679) 2,822
Property and equipment included in accounts payable and accrued expenses 210 210
Conversion of redeemable convertible preferred stock to common stock 329,534 0
Series F    
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs 0 $ 76,488
Series G    
Cash flows from financing activities:    
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs $ 84,710