Redeemable Convertible Preferred Stock - Summary of Redeemable Convertible Preferred Stock (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Series A Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	0	56,000,000
Redeemable convertible preferred stock, shares issued	0	56,000,000
Redeemable convertible preferred stock, shares outstanding	0	56,000,000	56,000,000
Redeemable convertible preferred stock. aggregate liquidation preference	$ 0	$ 62,468
Redeemable convertible preferred stock value	$ 0	$ 62,468	$ 61,516
Series B Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	0	49,501,221
Redeemable convertible preferred stock, shares issued	0	49,501,221
Redeemable convertible preferred stock, shares outstanding	0	49,501,221	49,501,221
Redeemable convertible preferred stock. aggregate liquidation preference	$ 0	$ 75,860
Redeemable convertible preferred stock value	$ 0	$ 75,860	$ 70,587
Series C Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized	0	44,000,000
Redeemable convertible preferred stock, shares issued	0	26,360,745
Redeemable convertible preferred stock, shares outstanding	0	26,360,745
Redeemable convertible preferred stock. aggregate liquidation preference	$ 0	$ 47,947
Redeemable convertible preferred stock value	$ 0	$ 47,947
Amended and Restated Certificate of Incorporation
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized		149,501,221
Redeemable convertible preferred stock, shares issued		131,861,966
Redeemable convertible preferred stock, shares outstanding		131,861,966
Redeemable convertible preferred stock. aggregate liquidation preference		$ 186,275
Redeemable convertible preferred stock value		$ 186,275
Amended and Restated Certificate of Incorporation | Series A Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized		56,000,000
Redeemable convertible preferred stock, shares issued		56,000,000
Redeemable convertible preferred stock, shares outstanding		56,000,000
Redeemable convertible preferred stock. aggregate liquidation preference		$ 62,468
Redeemable convertible preferred stock value		$ 62,468
Amended and Restated Certificate of Incorporation | Series B Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized		49,501,221
Redeemable convertible preferred stock, shares issued		49,501,221
Redeemable convertible preferred stock, shares outstanding		49,501,221
Redeemable convertible preferred stock. aggregate liquidation preference		$ 75,860
Redeemable convertible preferred stock value		$ 75,860
Amended and Restated Certificate of Incorporation | Series C Redeemable Convertible Preferred Stock
Temporary Equity [Line Items]
Redeemable convertible preferred stock, shares authorized		44,000,000
Redeemable convertible preferred stock, shares issued		26,360,745
Redeemable convertible preferred stock, shares outstanding		26,360,745
Redeemable convertible preferred stock. aggregate liquidation preference		$ 47,947
Redeemable convertible preferred stock value		$ 47,947