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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash flows from operating activities    
Net loss $ (14,154) $ (16,269)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 149 192
Accretion of debt discount and debt issuance costs 228 94
Stock-based compensation expense 4,243 4,506
Allowance for credit losses 35 36
Provision (benefit) for excess and obsolete inventories (21) (25)
Noncash operating lease expense 119 160
Noncash loss on debt extinguishment 0 1,033
Changes in operating assets and liabilities:    
Accounts receivable 1,327 (1,390)
Inventory 541 1,003
Prepaid expenses and other current assets (604) 317
Other noncurrent assets 32 12
Accounts payable 1,073 371
Accrued compensation (4,554) (501)
Accrued and other current liabilities (19) 2,116
Other noncurrent liabilities 0 (1,441)
Net cash used in operating activities (11,605) (9,786)
Cash flows from investing activities    
Purchases of property and equipment 0 (117)
Net cash used in investing activities 0 (117)
Cash flows from financing activities    
Net proceeds from Hercules Loan Agreement 0 34,526
Repayment of MidCap Loan Agreement 0 (35,375)
Debt issuance costs 0 (238)
Taxes paid on net share settlement of restricted stock units (47) 0
Proceeds from exercise of common stock options 63 145
Net cash (used in) provided by financing activities 16 (942)
Net change in cash and cash equivalents (11,589) (10,845)
Cash and cash equivalents at beginning of period 120,357 138,129
Cash and cash equivalents at end of period 108,768 127,284
Supplemental disclosure of cash flow information    
Cash paid for interest 1,035 1,054
Supplemental noncash disclosure of investing and financing activities    
Acquisition of property and equipment included in accounts payable and accrued liabilities 178 0
Common stock warrants issued upon execution of Hercules Loan Agreement $ 0 $ 609