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Stockholders' Equity - Additional Information (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2021
Tranche
$ / shares
shares
Mar. 31, 2021
USD ($)
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Tranche
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Dec. 31, 2021
$ / shares
shares
Class of Stock [Line Items]              
Shares authorized | shares 1,350,000,000   1,350,000,000   1,350,000,000   1,350,000,000
Common stock, authorized | shares 1,250,000,000   1,250,000,000   1,250,000,000   1,250,000,000
Preferred stock, authorized | shares 100,000,000   100,000,000   100,000,000   100,000,000
Preferred stock, par value | $ / shares $ 0.0001   $ 0.0001   $ 0.0001   $ 0.0001
Common stock voting rights, description         The holder of each share of Class A Common Stock is entitled to one vote, and the holder of each share of Class B Common Stock is entitled to ten votes.    
Proceeds from common stock           $ 462,926,000  
Options vesting period         4 years    
Granted stock option | shares         0 0  
Aggregate intrinsic value         $ 38,100,000 $ 355,000,000.0  
Stock-based compensation unvested stock options not yet recognized     $ 7,900,000   $ 7,900,000    
Expected to be recognized estimated weighted average period         1 year 10 months 20 days    
Fair value of restricted stock vested         $ 53,300,000 156,300,000  
Stock-based compensation expense     33,578,000 $ 12,727,000 $ 92,985,000 36,010,000  
Restricted Stock Unit              
Class of Stock [Line Items]              
Expected to be recognized estimated weighted average period         3 years    
Unrecognized compensation costs     219,000,000.0   $ 219,000,000.0    
EPA              
Class of Stock [Line Items]              
Options vesting period         10 years    
Granted stock option | shares             14,700,000
Expected to be recognized estimated weighted average period         2 years 3 months 18 days    
Unrecognized compensation costs     72,700,000   $ 72,700,000    
Number of tranches | Tranche 5       5    
Business milestones description         The compensation committee of the Board selected the following eleven business milestones for the EPA Program, of which one milestone must be achieved for each tranche.•Delivery of an A-sample battery cell that meets specifications agreed upon with an automaker•The validation by an auto maker of a completed B-sample battery cell (a B-sample battery cell is a functional, complete battery cell prototype produced from our pre-pilot or sample production line)•Delivery of at least 1-gigawatt hour (GWh) of battery cells to a single customer•Delivery of at least 3-gigawatt hour (GWh) of battery cells to each of three or more customers, with at least one of such customer being an auto maker•$5 billion in GAAP revenue over a period of trailing four quarters•$10 billion in GAAP revenue over a period of trailing four quarters•Total cumulative battery cell production of 500 GWh•Total cumulative battery cell production of 1,000 GWh•Adjusted EBITDA margin of at least 25% over four consecutive quarters•10% of worldwide market share in automotive battery cells (excluding China)•20% of worldwide market share in automotive battery cells (excluding China)    
Stock price targets description         To meet the stock price targets, the stock price must be sustained and not merely momentarily achieved. Except in the case of a change in control, the Company’s stock price for the purposes of assessing the stock price target will be the 120-day trailing average closing price (based on trading days), but a stock price target will not be achieved unless the trailing average closing price of the last 30 trading days of such 120-trading day period also meets or exceeds the applicable stock price target. For a stock price target for any given Tranche to be achieved, the last day of the 120-day measurement period must occur on or after the date that the requisite number of business milestones have been achieved for such Tranche.    
Number of Tranches Considered Probable | Tranche         2    
Stock-based compensation expense     12,100,000   $ 37,700,000    
EPA | Tranche 1              
Class of Stock [Line Items]              
Stock price targets         60    
EPA | Tranche 2              
Class of Stock [Line Items]              
Stock price targets         120    
EPA | Tranche 3              
Class of Stock [Line Items]              
Stock price targets         180    
EPA | Tranche 4              
Class of Stock [Line Items]              
Stock price targets         240    
EPA | Tranche 5              
Class of Stock [Line Items]              
Stock price targets         300    
EPA | Milestones Currently, Not Probable of Achievement              
Class of Stock [Line Items]              
Unrecognized compensation costs     $ 172,400,000   $ 172,400,000    
Class A Common Stock              
Class of Stock [Line Items]              
Common stock, authorized | shares 1,000,000,000   1,000,000,000   1,000,000,000   1,000,000,000
Common stock, par value | $ / shares $ 0.0001   $ 0.0001   $ 0.0001   $ 0.0001
Common stock, issued | shares 332,869,000   356,140,000   356,140,000   332,869,000
Stock issuance costs           $ 15,500,000  
Class A Common Stock | EPA              
Class of Stock [Line Items]              
Granted stock option | shares             14,700,000
Granted stock option with in one year anniversary | shares             2,100,000
Class A Common Stock | 2020 Equity Incentive Award Plan              
Class of Stock [Line Items]              
Common stock authorized for issuance | shares     62,915,959   62,915,959    
Class A Common Stock | Maximum | 2020 Equity Incentive Award Plan              
Class of Stock [Line Items]              
Common stock authorized for issuance | shares     69,846,580   69,846,580    
Class A Common Stock | March 2021 Public Offering              
Class of Stock [Line Items]              
Common stock, issued | shares   11,960,000          
Stock issuance costs   $ 15,500,000          
Proceeds from common stock   $ 462,900,000          
Class B Common Stock              
Class of Stock [Line Items]              
Common stock, authorized | shares 250,000,000   250,000,000   250,000,000   250,000,000
Common stock, par value | $ / shares $ 0.0001   $ 0.0001   $ 0.0001   $ 0.0001
Common stock, issued | shares 95,450,000   79,454,000   79,454,000   95,450,000