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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities    
Net loss $ (34,264) $ (39,661)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 379 536
Accretion of debt discount and debt issuance costs 714 550
Stock-based compensation expense 10,505 13,131
Allowance (benefit) for credit losses 28 (68)
Provision (benefit) for excess and obsolete inventories (3) (105)
Noncash operating lease expense 368 481
Loss on disposal of property and equipment 4 23
Noncash loss on debt extinguishment 0 1,033
Changes in operating assets and liabilities:    
Accounts receivable 1,014 1,427
Inventory (1,656) 1,863
Prepaid expenses and other current assets (926) (280)
Other noncurrent assets (134) (35)
Accounts payable 50 (41)
Accrued compensation (3,488) 3,360
Accrued and other current liabilities (458) 418
Other noncurrent liabilities 0 (1,524)
Net cash used in operating activities (27,867) (18,892)
Cash flows from investing activities    
Purchases of property and equipment (380) (248)
Net cash used in investing activities (380) (248)
Cash flows from financing activities    
Net proceeds from Hercules Loan Agreement 0 34,526
Repayment of Prior Loan Agreement 0 (35,375)
Debt issuance costs 0 (238)
Proceeds from employee stock purchase plan purchases 433 450
Taxes paid on net share settlement of restricted stock units (55) (20)
Proceeds from exercise of common stock options 148 232
Net cash provided by (used in) financing activities 526 (425)
Net change in cash, cash equivalents, and restricted cash (27,721) (19,565)
Cash, cash equivalents, and restricted cash at beginning of period 120,357 138,129
Cash, cash equivalents, and restrcited cash at end of period 92,636 118,564
Restricted Cash 263 0
Cash and cash equivalents at end of period 92,373 118,564
Supplemental disclosure of cash flow information    
Cash paid for interest 3,140 3,023
Supplemental noncash disclosure of investing and financing activities    
Acquisition of property and equipment included in accounts payable and accrued liabilities 0 43
Common stock warrants issued upon execution of Hercules Loan Agreement $ 0 $ 609