Stockholder's Equity - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended		9 Months Ended
	Sep. 25, 2020	Jul. 31, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares shares
Stockholders Equity [Line Items]
Reverse stock split				one-for-8.4335
Stock split conversion ratio	0.118574732
Common stock, par value per share				$ 0.0001	$ 0.0001
Common stock voting right				one vote for each share
Proceeds from issuance of convertible preferred stock | $				$ 145,525
Redeemable convertible preferred stock, shares issued | shares				256,003,042	113,145,900
Stock issuance costs | $				$ 4,473
Redeemable convertible preferred stock conversion basis				8.4335-to-one
Redeemable convertible preferred stock conversion ratio | shares				8.4335
Proceeds from issuance underwritten public offering | $				$ 50,000
Redeemable convertible preferred stock voting right				every 8.4335 shares of Preferred Stock was entitled to one vote
Series Seed Preferred Stock
Stockholders Equity [Line Items]
Redeemable convertible preferred stock, par value per share				$ 0.0005	$ 0.0005
Redeemable convertible preferred stock, shares issued | shares				4,000,000	4,000,000
Series A Preferred Stock
Stockholders Equity [Line Items]
Redeemable convertible preferred stock, par value per share				$ 0.0005	$ 0.0005
Redeemable convertible preferred stock, shares issued | shares				109,145,900	109,145,900
Redeemable convertible preferred stock dividends rate per annum				$ 0.08
Series B Convertible Preferred Stock
Stockholders Equity [Line Items]
Redeemable convertible preferred stock, par value per share				$ 0.0005	$ 0.0005
Proceeds from issuance of convertible preferred stock | $		$ 4,500	$ 145,500	$ 150,000
Redeemable convertible preferred stock, shares issued | shares		4,285,714	138,571,428	142,857,142	0
Shares issued price per share				$ 1.05
Stock issuance costs | $			$ 4,500
Redeemable convertible preferred stock dividends rate per annum				$ 0.084