XML 45 R34.htm IDEA: XBRL DOCUMENT v3.21.2
BUSINESS - Narrative (Details)
$ / shares in Units, $ in Thousands, hour in Millions
 3 Months Ended 9 Months Ended
Apr. 28, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2020
USD ($)
Apr. 27, 2021
$ / shares
Dec. 31, 2020
USD ($)
hour
$ / shares
Description Of Business [Abstract]                      
Number of runtime hours accumulated | hour                     20
Description Of Merger [Abstract]                      
Proceeds received $ 550,322                    
Preferred stock, par value (in dollars per share) | $ / shares   $ 0.0001           $ 0.0001   $ 0.00001 $ 0.0001
Common stock, par value (in dollars per share) | $ / shares   $ 0.0001           $ 0.0001   $ 0.000001 $ 0.0001
Exchange ratio 4.6432                    
Sale of stock, number of shares Issued in transaction (in shares) | shares 22,500,000                    
Sale of stock (in dollars per share) | $ / shares $ 10                    
Sale of stock aggregate purchase price $ 225,000                    
Net liabilities $ 304,000                    
Liquidity And Going Concern [Abstract]                      
Cash and cash equivalents   $ 405,189           $ 405,189     $ 6,942
Short-term investments   170,800           170,800      
Accumulated deficit   474,998           474,998     $ 407,841
Working capital   573,300           573,300      
Debt financing coming due within the next 12 months   14,300           14,300      
Net loss   $ (115,612) $ 100,216 $ 82,553 $ 18,785 $ 18,981 $ 17,471 67,157 $ 55,237    
Negative cash flows from operating activities               69,020 $ 17,921    
Proceeds from public exercises warrant               $ 145,300      
Maximum | Energy Storage Systems                      
Description Of Business [Abstract]                      
Estimated useful life               20 years