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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities    
Net loss $ (44,856) $ (69,335)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 455 557
Accretion of debt discount and amortization of debt issuance costs 452 502
Stock-based compensation expense 11,121 9,729
Provision for credit losses 416 395
Provision for excess and obsolete inventories 219 124
Noncash operating lease expense 743 374
Loss on disposal of property and equipment 66 55
Changes in operating assets and liabilities:    
Accounts receivable (2,187) (4,280)
Inventory (3,345) (2,169)
Prepaid expenses and other current assets 517 (245)
Other noncurrent assets (444) 0
Accounts payable 841 (77)
Accrued compensation (1,851) 2,006
Accrued and other current liabilities (3,089) 1,631
Other noncurrent liabilities 242 270
Net cash used in operating activities (40,700) (60,463)
Cash flows from investing activities    
Purchases of property and equipment (527) (841)
Net cash used in investing activities (527) (841)
Cash flows from financing activities    
Proceeds from exercise of common stock options 289 436
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 728 436
Net change in cash and cash equivalents (40,499) (60,868)
Cash and cash equivalents at beginning of period 185,000 260,687
Cash and cash equivalents at end of period 144,501 199,819
Supplemental disclosure of cash flow information    
Cash paid for interest 3,167 2,350
Supplemental noncash disclosure    
Acquisition of property and equipment included in accounts payable and accrued liabilities $ 81 $ 46