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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Cash used in operating activities:    
Net loss $ (65,393) $ (57,720)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation expense 2 1,088
Stock-based compensation 18,164 643
Amortization of right-of-use assets 1,050
Property and equipment impairment 19,285
Lease impairment 2,274
Loss (gain) on lease termination (2,015) 319
Non-cash interest expense 1,043 1,834
Non-cash debt issuance costs 11,460 3,527
Non-cash non-capitalized transaction costs 268
Loss on extinguishment of convertible notes 26,359
Gain on sale of property and equipment (284)
Gain on intellectual property transfer (2,500)
Remeasurement of share-based termination liability 979 296
Changes in operating assets and liabilities:    
Inventory (1,525) (235)
Prepaid expenses and other current assets 184 (294)
Other non-current assets (106) 713
Accounts payable (1,023) 490
Accrued expenses and other current liabilities (1,522) (316)
Operating lease liabilities (336) (5,717)
Share-based termination liabilities 6,053
Other non-current liabilities (188)
Net cash used in operating activities (16,147) (29,225)
Cash used in investing activities:    
Cash proceeds from sale of property and equipment 284
Purchases of property and equipment (23) (962)
Net cash used in investing activities (23) (678)
Cash provided by financing activities:    
Proceeds from the Merger with GAMC 5,268
Proceeds from issuance of common stock 360
Payments of deferred transaction costs (6,008) (1,418)
Payments for Amended Senior Notes (538)
Proceeds from related party notes 250
Payments for related party notes (250)
Payments of related party promissory note (648)
Net cash provided by financing activities 18,810 5,551
Exchange rate effect on cash, cash equivalents and restricted cash (62) 12
Net change in cash and cash equivalents, and restricted cash 2,578 (24,340)
Cash and cash equivalents and restricted cash - Beginning of year 934 25,274
Cash, cash equivalents, and restricted cash - end of year 3,512 934
Cash, cash equivalents, and restricted cash information:    
Cash and cash equivalents, beginning of year 894 22,932
Restricted cash, beginning of year 40 2,342
Cash, cash equivalents, and restricted cash, beginning of year 934 25,274
Cash and cash equivalents, end of year 3,512 894
Restricted cash, end of year 40
Cash, cash equivalents, and restricted cash, end of year 3,512 934
Supplementary cash flow disclosures:    
Cash paid for interest 472 1,650
Supplemental disclosures of non-cash investing and financing activities:    
Deferred transaction costs in accounts payable and accrued expenses 1,818 708
Deferred transaction costs due to Bridge Warrants issuance 14,108
Convertible note issuance costs due to Bridge Warrants issuance 3,527
Decrease of deferred transaction costs due to the Merger and PIPE Financing 11,624
Issuance of common stock to settle underwriting commission 6,106
Issuance of common stock upon conversion of convertible preferred stock 93,889
Issuance of common stock upon conversion of convertible bridge notes 102,155
Issuance of common stock upon settlement of shared-based termination liability 7,327
Conversion of convertible preferred stock warrants to Private Warrants 197
Decrease of operating lease right of use assets and liabilities due to remeasurement in connection with lease amendments 456
Decrease of operating lease liabilities due to lease termination 2,015 21,286
Conversion of convertible preferred stock to common stock 28,958
Decrease of prepaid expense due to trouble debt restructuring 10,373
Issuance of Gingko Convertible Note due to trouble debt restructuring 216,386
Issuance of Amended Senior Notes due to trouble debt restructuring 13,340
Modification of convertible preferred stock 5,366
Decrease of operating lease right of use assets due to lease termination 16,763
Nonrelated Party    
Adjustments to reconcile net loss to net cash used in operating activities:    
Remeasurement of convertible notes 31,664 281
Cash provided by financing activities:    
Proceeds from Bridge Financing Notes 22,643 6,969
Related Party    
Adjustments to reconcile net loss to net cash used in operating activities:    
Remeasurement of convertible notes 3,752 115
Cash provided by financing activities:    
Payments of related party convertible promissory note (2,267)
Convertible Preferred Stock Warrant Liability    
Adjustments to reconcile net loss to net cash used in operating activities:    
Remeasurement of convertible preferred stock warrant liability (6) (127)
Public Placement Warrant Liability    
Adjustments to reconcile net loss to net cash used in operating activities:    
Remeasurement of convertible preferred stock warrant liability (24,907)
Private Placement Warrant Liability    
Adjustments to reconcile net loss to net cash used in operating activities:    
Remeasurement of convertible preferred stock warrant liability $ (13,001)