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Convertible Preferred Stock - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 08, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 20, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Sale price of stock |  |  |  |  | $ 20.00
Outstanding convertible preferred stock converted into common shares | 37,206,604 |  | 59,883,877 |  |
Convertible preferred stock outstanding |  | 0 | 212,642,857 |  |
Preferred stock voting rights |  | The holders of the Convertible Preferred Stock had voting rights equivalent to the number of shares of common stock into which their shares of preferred stock would convert. So long as any of the Convertible Preferred Stock was outstanding, a requisite vote of the Convertible Preferred Stockholders, which was defined as a majority of the Convertible Preferred Stockholders, was required to affirm certain corporate actions, which included, but was not limited to, the disposal of assets, the acquisition of assets or a business and the authorization of additional shares of the Company’s capital. In addition, such actions required a requisite vote of the Series C preferred stockholders and a majority vote of the Series B preferred stockholders, if any of the respective preferred stock was outstanding. |  |  |
Dividends declared |  | $ 0 | $ 0 |  |
IPO [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Outstanding convertible preferred stock converted into common shares | 61,992,534 | 0 |  |  |
Underwritten Public Offering [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Preferred stock convertible conversion price |  | $ 22.80 |  |  |
Outstanding convertible preferred stock converted into common shares |  |  | 59,382,845 |  |
Net proceeds from exchange of stock |  | $ 100,000,000 |  |  |
Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Sale price of stock | $ 22.80 |  |  |  |
Series C Preferred Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Preferred stock convertible conversion price | $ 3.027603 | $ 3.21 |  |  |
Outstanding convertible preferred stock converted into common shares |  |  | 35,097,955 |  |
Issuance of common stock in public offering, net of discounts and issuance costs of $34,707, shares |  |  | 1,779,093 | 122,850,909 |
Net proceeds from exchange of stock |  |  |  | $ 393,587,000 |
Shares price, per share |  |  | $ 3.21 |  |
Proceeds from issuance costs |  |  | $ 5,661,000 |  |
Convertible preferred stock outstanding |  |  | 124,630,002 |  |
Liquidation preference per share |  | 3.21 |  |  |
Series C Preferred Stock [Member] | Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Liquidation preference per share |  | 22.80 |  |  |
Series C Preferred Stock [Member] | Minimum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Liquidation preference per share |  | 22.80 |  |  |
Series A Preferred Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Outstanding convertible preferred stock converted into common shares |  |  | 16,002,820 |  |
Issuance of common stock in public offering, net of discounts and issuance costs of $34,707, shares |  |  |  | 56,824,740 |
Net proceeds from exchange of stock |  |  |  | $ 56,692,000 |
Convertible preferred stock outstanding |  |  | 56,824,740 |  |
Liquidation preference per share |  | 1.00 |  |  |
Series B Preferred Stock [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Outstanding convertible preferred stock converted into common shares |  |  | 8,783,102 |  |
Issuance of common stock in public offering, net of discounts and issuance costs of $34,707, shares |  |  |  | 31,188,115 |
Net proceeds from exchange of stock |  |  |  | $ 62,876,000 |
Convertible preferred stock outstanding |  |  | 31,188,115 |  |
Liquidation preference per share |  | $ 2.02 |  |  |

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