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Convertible Preferred Stock - Summary of Convertible Preferred Stock (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Jul. 08, 2020 | Dec. 31, 2019
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Class Of Stock [Line Items] |  |  |
Preferred stock shares authorized |  |  | 337,272,859
Preferred stock shares issued |  |  | 212,642,857
Preferred stock shares outstanding | 0 |  | 212,642,857
Carrying value |  |  | $ 537,781
Liquidation preference |  |  | $ 519,825
Common stock issuable upon conversion |  | 37,206,604 | 59,883,877
Series A Preferred Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock shares authorized |  |  | 56,824,740
Preferred stock shares issued |  |  | 56,824,740
Preferred stock shares outstanding |  |  | 56,824,740
Carrying value |  |  | $ 75,657
Liquidation preference |  |  | $ 56,825
Common stock issuable upon conversion |  |  | 16,002,820
Series B Preferred Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock shares authorized |  |  | 31,188,115
Preferred stock shares issued |  |  | 31,188,115
Preferred stock shares outstanding |  |  | 31,188,115
Carrying value |  |  | $ 62,876
Liquidation preference |  |  | $ 63,000
Common stock issuable upon conversion |  |  | 8,783,102
Series C Preferred Stock [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Preferred stock shares authorized |  |  | 249,260,004
Preferred stock shares issued |  |  | 124,630,002
Preferred stock shares outstanding |  |  | 124,630,002
Carrying value |  |  | $ 399,248
Liquidation preference |  |  | $ 400,000
Common stock issuable upon conversion |  |  | 35,097,955

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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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