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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Cash flows from operating activities:    
Net loss $ (36,369) $ (27,402)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 1,475 1,765
Stock-based compensation expense 4,228 1,375
Change in fair value of redeemable convertible preferred stock warrants and derivative liability 74 (43)
Non-cash lease adjustment (193) (158)
Changes in operating assets and liabilities:    
Accounts receivable, net (6,430) (3,591)
Inventory (684) (2,761)
Prepaid expenses and other current assets 471 (1,412)
Other assets (302) 0
Accounts payable 947 2,120
Accrued compensation 431 (653)
Accrued interest expense 503 532
Deferred revenue 838 431
Other liabilities (346) 1,690
Net cash used in operating activities (35,357) (28,107)
Cash flows from investing activities:    
Purchases of property and equipment (273) (149)
Net cash used in investing activities (273) (149)
Cash flows from financing activities:    
Proceeds from issuance of Series G preferred stock, net of issuance costs 0 84,710
Proceeds from issuance of common stock under employee stock purchase plan 1,289 0
Proceeds from issuance of common stock from the exercise of stock options 2,864 2,640
Net cash provided by financing activities 4,153 87,350
Net (decrease) increase in cash, cash equivalents and restricted cash (31,477) 59,094
Cash, cash equivalents, and restricted cash- Beginning of period 305,097 100,907
Cash, cash equivalents, and restricted cash - End of period 273,620 160,001
Reconciliation of cash, cash equivalents and restricted cash to balance sheets:    
Cash and cash equivalents 269,806 159,224
Restricted cash 3,814 777
Cash, cash equivalents and restricted cash in balance sheets 273,620 160,001
Supplemental cash flow information    
Interest paid 2,369 2,369
Non-cash investing and financing activities    
Transfer of evaluation units from inventory to property and equipment, net 53 (439)
Property and equipment included in accounts payable and other current liabilities 566 226
Deferred offering costs included in accounts payable and other current liabilities $ 0 $ 856