Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Provision for income taxes	$ 1,063	$ 86	$ 6,640	$ 27,046
Valuation allowance	3,600	$ 26,700	3,600	26,700
Income tax expense (benefit)			3,000	$ 300
Unrecognized tax benefits	$ 0		$ 0		$ 0