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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash flows from operating activities    
Net loss $ (31,821) $ (47,106)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 295 375
Accretion of debt discount and amortization of debt issuance costs 294 328
Stock-based compensation expense 7,265 6,506
Provision for credit losses 40 105
Provision for excess and obsolete inventories 208 118
Noncash operating lease expense 489 246
Loss on disposal of property and equipment 66 49
Changes in operating assets and liabilities:    
Accounts receivable (2,995) (1,870)
Inventory (2,001) (1,583)
Prepaid expenses and other current assets 1,622 2,129
Other noncurrent assets (156) (34)
Accounts payable 190 (608)
Accrued compensation (1,632) 299
Accrued and other current liabilities (2,894) 599
Other noncurrent liabilities 158 176
Net cash used in operating activities (30,872) (40,271)
Cash flows from investing activities    
Purchases of property and equipment (223) (569)
Net cash used in investing activities (223) (569)
Cash flows from financing activities    
Proceeds from exercise of common stock options 171 250
Taxes paid on the net share settlement of restricted stock units (222) 0
Proceeds from employee stock purchase plan purchases 661 0
Net cash provided by financing activities 610 250
Net change in cash and cash equivalents (30,485) (40,590)
Cash and cash equivalents at beginning of period 185,000 260,687
Cash and cash equivalents at end of period 154,515 220,097
Supplemental disclosure of cash flow information    
Cash paid for interest 2,066 1,548
Supplemental noncash disclosure    
Acquisition of property and equipment included in accounts payable and accrued liabilities $ 147 $ 279