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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Operating activities:        
Net loss $ (10,542) $ (65,526) $ (65,393) $ (57,720)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation expense 1 1 2 1,088
Stock-based compensation 3,694 195 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 271 580 1,043 1,834
Non-cash debt issuance costs 9,417 11,460 3,527
Non-cash non-capitalized transaction costs     268
Loss on extinguishment of convertible notes 26,359 26,359
Gain on sale of property and equipment     (284)
Gain on intellectual property transfer     (2,500)
Remeasurement of share-based termination liability 1,312 979 296
Changes in operating assets and liabilities:        
Accounts receivable (697)    
Inventory 1,414 (2,755) (1,525) (235)
Prepaid expenses and other current assets 2,301 269 184 (294)
Other non-current assets 18 300 (106) 713
Accounts payable 1,902 (585) (1,023) 490
Accrued expenses and other current liabilities (475) 634 (1,522) (316)
Operating lease liabilities (101) (336) (5,717)
Share-based termination liabilities     6,053
Other non-current liabilities (593) (188)
Net cash used in operating activities (2,856) (7,362) (16,147) (29,225)
Investing activities:        
Cash proceeds from sale of property and equipment     284
Purchases of property and equipment (12) (13) (23) (962)
Net cash used in investing activities (12) (13) (23) (678)
Financing activities:        
Payments of deferred transaction costs (185) (2,371) (6,008) (1,418)
Proceeds from the Merger with GAMC     5,268
Proceeds from issuance of common stock 515 360
Payments for Amended Senior Notes     (538)
Proceeds from issuance of related party notes 250 250
Payments on related party notes (250) (250)
Payments of related party promissory note     (648)
Net cash provided by financing activities 330 16,300 18,810 5,551
Exchange rate effect on cash, cash equivalents and restricted cash (47) (62) 12
Net change in cash, cash equivalents and restricted cash (2,538) 8,878 2,578 (24,340)
Cash, cash equivalents and restricted cash at beginning of period 3,512 934 934 25,274
Cash, cash equivalents and restricted cash at end of period 974 9,812 3,512 934
Cash, cash equivalents, and restricted cash information:        
Cash and cash equivalents, beginning of year 3,512 894 894 22,932
Restricted cash, beginning of year 40 40 2,342
Cash, cash equivalents, and restricted cash, beginning of year 3,512 934 934 25,274
Cash and cash equivalents, end of year 974   3,512 894
Restricted cash, end of year     40
Cash, cash equivalents, and restricted cash, end of year     3,512 934
Supplemental cash flow disclosures:        
Cash paid for income taxes    
Cash paid for interest 962 62 472 1,650
Supplemental disclosures of non-cash investing and financing activities:        
Deferred transaction costs in accounts payable and accrued expenses 54 637 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
Convertible Preferred Stock Warrant Liability        
Adjustments to reconcile net loss to net cash used in operating activities:        
Remeasurement of warrant liability (97) (6) (127)
Public Placement Warrant Liability        
Adjustments to reconcile net loss to net cash used in operating activities:        
Remeasurement of warrant liability (262) (24,907)
Related Party Private Placement Warrant Liability        
Adjustments to reconcile net loss to net cash used in operating activities:        
Remeasurement of warrant liability 112 (13,001)
Nonrelated Party        
Adjustments to reconcile net loss to net cash used in operating activities:        
Remeasurement of convertible notes 17,087 31,664 281
Financing activities:        
Proceeds from Bridge Financing Notes 18,671 22,643 6,969
Related Party        
Adjustments to reconcile net loss to net cash used in operating activities:        
Remeasurement of convertible notes $ 5,548 3,752 115
Financing activities:        
Payments of related party convertible promissory note     $ (2,267)