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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (55,547) $ (86,242)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 614 710
Accretion of debt discount and amortization of debt issuance costs 614 657
Stock-based compensation expense 14,581 12,963
Provision for credit losses 198 402
Provision for excess and obsolete inventories 418 614
Noncash operating lease cost 1,006 542
Loss on disposal of property and equipment 66 85
Changes in operating assets and liabilities:    
Accounts receivable 661 (6,841)
Inventory (2,156) (3,253)
Prepaid expenses and other current assets 812 751
Other noncurrent assets (470) (10)
Accounts payable (883) (694)
Accrued compensation (2,823) 1,364
Accrued and other current liabilities (4,605) 2,634
Other noncurrent liabilities 330 353
Net cash used in operating activities (47,184) (75,965)
Cash flows from investing activities:    
Purchases of property and equipment (791) (970)
Net cash used in investing activities (791) (970)
Cash flows from financing activities:    
Proceeds from exercise of common stock options 395 576
Taxes paid on net settlement of restricted stock units (224) 0
Proceeds from employee stock purchase plan purchases 933 672
Net cash provided by financing activities 1,104 1,248
Net change in cash and cash equivalents (46,871) (75,687)
Cash and cash equivalents at beginning of period 185,000 260,687
Cash and cash equivalents at end of period 138,129 185,000
Supplemental disclosure of cash flow information    
Cash paid for interest 4,267 3,252
Supplemental disclosure of non-cash investing and financing information    
Acquisition of property and equipment included in accounts payable and accrued liabilities $ 60 $ 103