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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

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