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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income (loss) $ 25,677 $ (42,842)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization expense 661 2,685
Stock-based compensation expense 1,360 2,797
Reduction in the operating right of use assets 1,265 5,570
Write-off of deferred financing costs 208 0
Loss on sale of assets held for sale 3,219 0
Gain (loss) on sale of property and equipment (113) 74
Non-cash interest expense 31 192
Loss on abandonment of operating lease right-of-use asset 927 0
Gain on sale of sale-leaseback 0 (82)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 2,523 (4,460)
Accounts payable 3,091 (2,228)
Accrued expenses (6,360) (3,120)
Deferred revenue (44,979) (4,481)
Operating lease liabilities (1,630) (5,823)
Other long term liabilities 57 153
Net cash used in operating activities (14,063) (51,565)
Cash flows from investing activities:    
Proceeds from sales of assets held for sale 163 0
Proceeds from sales of property and equipment 524 0
Purchases of property and equipment 0 (123)
Net cash provided by (used in) investing activities 687 (123)
Cash flows from financing activities:    
Payment of principal related to finance lease liabilities (244) (1,158)
Proceeds from failed sale-leaseback arrangement 0 686
Payment of finance liability from failed sale-leaseback arrangements (1,517) (983)
Proceeds from the exercise of stock options 5 4
Sale of common stock under Open Market Sale Agreement, net of issuance costs 0 2,415
Net cash (used in) provided by financing activities (1,756) 964
Net decrease in cash, cash equivalents and restricted cash (15,132) (50,724)
Cash, cash equivalents, and restricted cash at beginning of the year 17,909 77,605
Cash, cash equivalents and restricted cash at end of the period 2,777 26,881
Supplemental disclosures of cash flow information:    
Cash paid for interest 57 153
Supplemental disclosure of non-cash financing and investing activities:    
Financing costs in accounts payable 0 23
Right-of-use assets obtained in exchange for new operating lease liabilities 836 5,719
Right-of-use assets obtained in exchange for new finance lease liabilities 0 1,660
Disposal of property and equipment in exchange for reduction in finance lease liability 0 396
Reclassification of deferred financing costs to additional paid-in capital 0 9
Finance lease liability settled by security deposit 303 0
Remeasurement of finance right-of-use asset $ 399 $ 0