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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (18,367) $ (17,286)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 95 75
Noncash lease expense relating to operating lease right-of-use assets 193 103
Gain on termination of operating lease, net 0 (1,612)
Common stock purchase agreement costs 233 306
Debt issuance costs 0 2,020
Inventory write-downs, net of scrapped inventory 0 24
Change in fair value of convertible note and warrant liabilities (149) (87)
Stock-based compensation 3,961 3,661
Amortization of premiums and accretion of discounts on marketable securities, net of change in accrued interest (106) (157)
Expected credit losses, net of write-off 0 2
Changes in operating assets and liabilities:    
Accounts receivable, net (139) (18)
Inventories, current and noncurrent, net 12 (114)
Prepaid and other current assets 480 84
Other noncurrent assets 53 134
Accounts payable 147 1,761
Accrued expenses and other current liabilities (2,054) (1,522)
Operating lease liabilities (201) (1,532)
Net cash used in operating activities (15,842) (14,158)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (319) (14)
Purchases of marketable securities (31,411) (14,303)
Proceeds from redemptions and maturities of marketable securities 14,200 9,631
Net cash used in investing activities (17,530) (4,686)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of convertible note 0 2,950
Payments for convertible note redemptions 0 (750)
Transaction costs related to issuance of convertible note 0 (608)
Proceeds from issuance of common stock under Common Stock Purchase Agreements 1,977 10,076
Stock issuance costs related to Common Stock Purchase Agreements (341) (404)
Taxes paid related to the net share settlement of equity awards (519) (364)
Proceeds from issuance of common stock through the Employee Stock Purchase Plan 109 52
Net cash provided by financing activities 1,226 10,952
NET DECREASE IN CASH AND CASH EQUIVALENTS (32,146) (7,892)
CASH AND CASH EQUIVALENTS—Beginning of period 43,356 10,266
CASH AND CASH EQUIVALENTS—End of period 11,210 2,374
SUPPLEMENTAL CASH FLOW INFORMATION:    
Cash paid for income taxes, net of refund 2 21
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:    
Noncash debt issuance costs 0 1,362
Debt issuance costs included in accounts payable and accrued liabilities 0 50
Stock issuance costs included in accounts payable and accrued liabilities 62 213
Purchases of property and equipment included in accounts payable and accrued liabilities 0 5
Modification of operating lease liabilities and right-of-use asset $ 1,033 $ 0