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Stockholders' Equity - Narrative (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 16, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 1,000,000,000 |  |  | 1,000,000,000 |  | 1,000,000,000
Common stock, par value (in dollars per share) |  | $ 0.0001 |  |  | $ 0.0001 |  | $ 0.0001
Preferred stock, shares authorized (in shares) |  | 10,000,000 |  |  | 10,000,000 |  | 10,000,000
Common stock, voting rights |  |  |  |  | one |  |
Common stock, shares outstanding (in shares) |  | 136,754,685 |  |  | 136,754,685 |  | 70,266,925
Stock options available for grant (in shares) |  | 10,527,368 |  |  | 10,527,368 |  | 10,244,399
Stock options, exercisable (in shares) |  | 3,808,472 |  |  | 3,808,472 |  | 2,150,941
Stock option, aggregate intrinsic value |  | $ 47,014,274 |  |  | $ 47,014,274 |  |
Stock-based compensation |  |  |  |  | 4,808,000 | $ 78,000 |
Stock compensation not yet recognized |  | $ 7,300,000 |  |  | $ 7,300,000 |  |
Stock compensation not yet recognized, vesting period |  |  |  |  | 4 years |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  | 1,010,000,000 |  |  | 1,010,000,000 |  |
Common stock, par value (in dollars per share) |  | $ 0.0001 |  |  | $ 0.0001 |  |
Warrants issued (in shares) |  |  |  |  | 1,000,000,000 |  |
Common stock, shares outstanding (in shares) |  | 136,754,685 |  |  | 136,754,685 |  | 70,266,925
General and administrative expense |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock-based compensation |  | $ 600,000 |  | $ 100,000 | $ 4,800,000 | $ 100,000 |
Research and development expense |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock-based compensation |  | $ 200,000 |  | $ 0 |  |  |
Performance and market based awards |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock options issued during the period (in shares) |  |  |  |  |  |  | 2,920,732
Stock options, vested (in shares) | 529,119 |  |  |  |  |  |
Stock-based compensation |  |  |  |  | $ 2,900,000 |  |
Performance and market based awards | First vesting |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock option plan, vesting percentage |  |  | 2.0833% |  |  |  |
Stock options, outstanding (in shares) |  |  | 529,119 |  |  |  |
Performance and market based awards | Second vesting |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock options, outstanding (in shares) |  | 2,391,613 |  |  | 2,391,613 |  |
Stock Plan |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares reserved (in shares) |  | 18,467,109 |  |  | 18,467,109 |  |
Stock option plan, exercisable period |  |  |  |  | 4 years |  |
Stock Plan | Share-based payment arrangement, nonemployee |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock option plan, exercisable period |  |  |  |  | 10 years |  |
Stock Plan | One year from the vesting commencement date |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock option plan, vesting percentage |  |  |  |  | 25.00% |  |
Option vesting period |  |  |  |  | 1 year |  |
Stock Plan | More than one year from vesting commencement date |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock option plan, vesting percentage |  |  |  |  | 2.778% |  |

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