Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Income Tax Contingency [Line Items]
Provision for (benefit from) income taxes	$ 2,538		$ (100)	$ 2,285	$ (87)
Income tax provision on operating income	2,700			4,300
Income tax benefit from settlement of uncertain tax benefits	$ (200)			(500)
Valuation allowance						$ 55,400
Increase in valuation allowance recorded as an expense				31,200		35,100
Decrease in valuation allowance charged to equity						$ (28,200)
Income tax benefit recognized as result of CARES Act					$ 600
Foreign Tax Authority
Income Tax Contingency [Line Items]
Increase in valuation recorded		$ 6,900
Income tax benefit from settlement of uncertain tax benefits				$ (1,500)