Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Dec. 11, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Preferred Units [Line Items]
Preferred stock shares authorized	10,000,000			10,000,000	10,000,000
Preferred stock par value (in usd per share)	$ 0.0001			$ 0.0001	$ 0.0001
Class B
Preferred Units [Line Items]
Convertible preferred stock, shares issued upon conversion					33,443,969
Convertible Preferred Stock
Preferred Units [Line Items]
Temporary equity, carrying amount, attributable to parent	$ 0	$ 0	$ 0	$ 0	$ 61,200	$ 61,216	$ 61,216	$ 61,216	$ 61,216