Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) - Preferred Stock (Details) - Convertible Preferred Stock - Series B - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Redeemable Convertible Preferred Stock and Stockholders’ Deficit
Shares issued (in shares)		12,527,956	3,607,069
Issue price		$ 1.16	$ 1.16
Gross proceeds	$ 14.5		$ 4.2
Transaction Fee		$ 0.2