v3.26.1
Description of Business and Basis of Presentation - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 29, 2026
$ / shares
shares
Feb. 23, 2026
shares
Jul. 01, 2025
USD ($)
GBP (£)
shares
Jun. 26, 2025
shares
Jun. 30, 2026
USD ($)
$ / shares
shares
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2026
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
Feb. 24, 2026
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Jun. 25, 2025
shares
Subsidiary, Sale of Stock [Line Items]                          
Loss from operations         $ 3,372   $ 5,824   $ 7,362 $ 12,134      
Net cash used in operating activities                 (5,636) $ (5,743)      
Accumulated deficit         245,389       245,389     $ 227,542  
Cash and cash equivalents         $ 959       $ 959     $ 512  
Reverse Stock Split rate description 1-for-7 1-for-10   1-for-10                  
Common stock, par value | $ / shares         $ 0.0001       $ 0.0001     $ 0.0001  
Common stock, shares Issued | shares       1,409,047 514,467       514,467     43,930 14,091,197
Common stock, shares outstanding | shares 3,601,274 17,984,137   1,409,047 514,467       514,467   1,798,406 43,930 14,091,197
Loan receivable         $ 0       $ 0     $ 6,592  
Issuance of shares upon conversion, value         1,939 $ 5,868 4,225 $ 5,799          
Wattbike Acquisition [Member]                          
Subsidiary, Sale of Stock [Line Items]                          
Issuance of common stock | shares     1,300,000                    
Purchase price payable closing of transaction | £     1                    
Loan receivable     $ 1,200                    
Purchase price of asset acquisition     3,700                    
Contingent consideration     200                    
Wattbike Acquisition [Member] | Series B Preferred Stock [Member]                          
Subsidiary, Sale of Stock [Line Items]                          
Issuance of shares upon conversion, value     $ 2,300                    
ASU 205-40 [Member]                          
Subsidiary, Sale of Stock [Line Items]                          
Loss from operations                 7,400        
Net cash used in operating activities                 5,600        
Accumulated deficit         245,400       245,400        
Debt instrument aggregate outstanding amount         $ 23,100       $ 23,100        
Common Stock [Member]                          
Subsidiary, Sale of Stock [Line Items]                          
Common stock, par value | $ / shares $ 0.0001       $ 0.0001       $ 0.0001     $ 0.0001  
Common stock, shares Issued | shares         514,467       514,467     43,930  
Common stock, shares outstanding | shares         514,467       514,467     43,930  
Issuance of shares upon conversion, value           $ 1 $ 1 $ 1