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Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Sep. 15, 2020 shares | Jun. 11, 2020 $ / shares shares | Jun. 08, 2020 USD ($) shares | Jun. 30, 2020 | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) PreferredStock $ / shares shares | Dec. 31, 2018 USD ($) | Jun. 23, 2020 shares | Aug. 31, 2017 $ / shares shares
Redeemable Convertible Preferred Stock And Stockholders Deficit Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of outstanding series of redeemable convertible preferred stock | PreferredStock |  |  |  |  |  | 8 |  |  |
Accretion to redemption values | $ |  |  |  |  |  | $ 132,800 |  |  |
Common stock, issued | 10,800,000 |  |  |  |  |  |  |  |
Gross proceeds from issuance of preferred stock | $ |  |  |  |  | $ 21,694 | $ 227,502 | $ 145,899 |  |
Preferred stock converted into common stock |  | 85,533,394 |  |  |  |  |  |  |
Preferred stock, authorized |  | 10,000,000 |  |  |  |  |  |  |
Preferred stock, issued |  |  |  |  | 0 |  |  |  |
Preferred Stock, outstanding |  |  |  |  | 0 |  |  |  |
Forward stock split |  | 2 |  | 2 |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.001 |  |  | $ 0.001 | $ 0.001 |  |  |
Common stock, voting rights |  |  |  |  | one vote |  |  |  |
Stock split, description |  |  |  | 2-for-1 | On June 11, 2020, the Company amended its certificate of incorporation to effect a 2-for-1 forward stock split of shares of the Company’s outstanding common stock, such that each share of common stock, $0.001 par value became two shares of common stock, $0.001 par value per share. |  |  |  |
Common stock, shares authorized |  | 500,000,000 |  |  | 500,000,000 | 113,443,854 |  |  |
Series B Warrants |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock And Stockholders Deficit Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock |  | 155,862 |  |  |  |  |  |  |
Exercise price | $ / shares |  |  |  |  | $ 0.72 |  |  |  |
Maximum | Series B Warrants |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock And Stockholders Deficit Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock |  |  |  |  | 161,136 |  |  |  |
Series H Preferred Stock |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock And Stockholders Deficit Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock, issued |  |  | 1,964,766 |  |  |  |  |  |
Gross proceeds from issuance of preferred stock | $ |  |  | $ 26,700 |  |  |  |  |  |
Series F Preferred Stock Warrant |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock And Stockholders Deficit Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock |  |  |  |  |  |  |  | 480,250 |
Exercise price | $ / shares |  |  |  |  |  |  |  |  | $ 8.53
Series F Preferred Stock Warrant | Maximum |  |  |  |  |  |  |  |  |
Redeemable Convertible Preferred Stock And Stockholders Deficit Equity [Line Items] |  |  |  |  |  |  |  |  |
Warrants to purchase shares of common stock |  |  |  |  |  |  |  |  | 589,970

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