Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Disaggregation of Revenue (Details)

v3.21.2
Summary of Significant Accounting Policies - Disaggregation of Revenue (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
mi²
Sep. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Revenue Summary                
Revenues $ 6,257 $ 3,802 $ 16,771 $ 5,368        
Product warranty period     5 years          
Warranty area covered | mi²     60,000          
Advertising costs   10   32        
Right-of-use assets 8,840   $ 8,840     $ 7,881    
Lease liabilities 10,466   10,466     9,034    
Accumulated deficit (203,750)   (203,750)     (80,795)    
Equity 2,010 (14,547) 2,010 (14,547) $ 39,522 $ (26,695) $ 863 $ 370
Cumulative Effect, Adjustment                
Revenue Summary                
Equity               22
ASU 2016-02 | Cumulative Effect, Adjustment                
Revenue Summary                
Right-of-use assets               3,683
Other long-term liabilities               328
Lease liabilities               4,011
Accumulated deficit               $ (22)
Selling, general and administrative                
Revenue Summary                
Advertising costs 64   116          
Manufacturing conversions - direct to customer                
Revenue Summary                
Revenues 5,588 3,366 15,084 3,630        
Conversion kits - direct to customer                
Revenue Summary                
Revenues     218          
Conversion kits - certified installer or dealers                
Revenue Summary                
Revenues       1,320        
Charging systems                
Revenue Summary                
Revenues 242 70 244 70        
Other                
Revenue Summary                
Revenues $ 427 $ 366 $ 1,225 $ 348