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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (33,376) $ (63,118)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 1,291 1,781
Stock-based compensation expense 2,782 7,407
Accretion of discount on marketable securities (670) (2,615)
Gain on sale of fixed assets (288) (70)
Asset impairment 0 1,469
Non-cash lease expense 2,526 2,297
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 76 2,571
Accounts payable and accrued expenses (5,430) (4,883)
Operating lease liabilities, net (2,251) (1,412)
Deferred revenue (4,642) (4,673)
Other long-term liabilities 132 (43)
Net cash used in operating activities (39,850) (61,289)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (72) (41)
Proceeds from sales of property and equipment 963 148
Purchases of marketable securities (29,016) (88,855)
Maturities of marketable securities 72,427 146,324
Net cash provided by investing activities 44,302 57,576
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of common stock 19 108
Net cash provided by financing activities 19 108
NET INCREASE (DECREASE) IN CASH 4,471 (3,605)
Cash, cash equivalents and restricted cash at beginning of year 8,970 12,575
Cash, cash equivalents and restricted cash at end of period 13,441 8,970
Reconciliation of cash, cash equivalents and restricted cash:    
Cash and cash equivalents 11,703 7,205
Restricted cash 1,738 1,765
Total cash, cash equivalents and restricted cash 13,441 8,970
Supplemental schedule of non-cash investing and financing activities:    
Right of use assets obtained in exchange for operating lease obligations $ 0 $ 6,402