v3.26.1
RELATED PARTY TRANSACTIONS (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Related Party Transaction [Line Items]          
Research and development, net   $ 6,582,000 $ 6,745,000 $ 8,524,000 $ 13,499,000
Receivables under collaboration agreements $ 1,152,000 103,000   103,000  
Prepaid expenses and other current assets 1,425,000 2,667,000   2,667,000  
Selling, general and administrative   6,379,000 4,657,000 10,928,000 11,025,000
Accounts payable 741,000 720,000   720,000  
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement          
Related Party Transaction [Line Items]          
Research and development, net   200,000 200,000 3,600,000 200,000
Related Party          
Related Party Transaction [Line Items]          
Research and development, net   10,000 140,000 10,000 165,000
Selling, general and administrative   65,000 44,000 153,000 88,000
Mercedes-Benz | Related Party | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement          
Related Party Transaction [Line Items]          
Research and development, net   100,000   100,000  
Stellantis | Related Party | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement          
Related Party Transaction [Line Items]          
Research and development, net   200,000   400,000  
Receivables under collaboration agreements 1,000,000.0 0   0  
Prepayments for services 2,000,000.0        
Prepaid expenses and other current assets 1,000,000.0 700,000   700,000  
Joseph Taylor | Related Party          
Related Party Transaction [Line Items]          
Selling, general and administrative   $ 100,000 $ 100,000 $ 200,000 $ 100,000
Accounts payable $ 200,000