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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net loss $ (78,393) $ (58,982)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 2,489 2,178
Stock-based compensation expense 14,153 7,452
Change in fair value in derivative liability 80 113
Non-cash lease adjustment 123 645
Inventory write-down 995 87
Changes in operating assets and liabilities:    
Accounts receivable, net (19,349) (8,375)
Inventory (12,937) (9,502)
Prepaid expenses and other current assets 2,194 (2)
Other assets (365) (202)
Accounts payable (87) 4,243
Accrued compensation (182) 3,810
Accrued interest expense 93 688
Deferred revenue 2,668 1,318
Reimbursements for leasehold improvements from operating leases 4,989 0
Other liabilities 319 1,321
Net cash used in operating activities (83,210) (55,208)
Cash flows from investing activities:    
Purchases of property and equipment (16,491) (1,787)
Net cash used in investing activities (16,491) (1,787)
Cash flows from financing activities:    
Proceeds from the issuance of common stock, net of issuance costs 161,705 0
Proceeds from issuance of common stock under employee stock purchase plan 1,717 1,289
Proceeds from issuance of common stock from the exercise of stock options 1,507 3,641
Net cash provided by financing activities 164,929 4,930
Net increase (decrease) in cash, cash equivalents and restricted cash 65,228 (52,065)
Beginning of the period 225,674 305,096
End of the period 290,902 253,031
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 287,087 249,217
Restricted cash 3,815 3,814
Cash, cash equivalents and restricted cash in balance sheets 290,902 253,031
Supplemental cash flow information    
Interest paid 3,052 3,573
Non-cash investing and financing activities    
Transfer of evaluation units from inventory to property and equipment, net (123) 203
Property and equipment included in accounts payable and other current liabilities 7,837 200
Right-of-use-assets obtained in exchange for operating lease liabilities $ 0 $ 22,668