Capital Stock and Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) vote $ / shares shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 $ / shares shares
Class of Stock [Line Items]
Common stock, authorized (in shares)		105,000,000
Preferred stock, authorized (in shares)		5,000,000		5,000,000
Proceeds from return of profit | $	$ 11,400	$ 11,403	$ 0
Class A common stock
Class of Stock [Line Items]
Common stock, authorized (in shares)		94,000,000		94,000,000
Common stock, par value (usd per share) | $ / shares		$ 0.00001		$ 0.00001
Voting rights (per share) | vote		1
Class B common stock
Class of Stock [Line Items]
Common stock, authorized (in shares)		6,000,000		6,000,000
Common stock, par value (usd per share) | $ / shares		$ 0.00001		$ 0.00001
Voting rights (per share) | vote		10