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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 $ (14,964) $ (19,601)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 374 746
Stock-based compensation expense 1,097 1,334
Accretion of discount on marketable securities (122) (379)
Gain on sale of property and equipment (404) (288)
Asset impairment 808 0
Non-cash lease expense 1,347 1,239
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (160) (236)
Accounts payable and accrued expenses (1,203) (3,351)
Operating lease liabilities (1,334) (1,026)
Deferred revenue (2) (1,533)
Other long-term liabilities 0 133
Net cash used in operating activities (14,563) (22,962)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (13) 0
Proceeds from sales of property and equipment 717 963
Purchases of marketable securities (1,230) (15,457)
Maturities of marketable securities 16,221 39,838
Net cash provided by investing activities 15,695 25,344
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 25 14
Net cash provided by financing activities 25 14
NET INCREASE (DECREASE) IN CASH 1,157 2,396
Cash, cash equivalents and restricted cash at beginning of year 13,441 8,970
Cash, cash equivalents and restricted cash at end of period 14,598 11,366
Reconciliation of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 12,860 9,601
Restricted cash 1,738 1,765
Total cash, cash equivalents and restricted cash $ 14,598 $ 11,366