Overview and Basis of Presentation - Schedule of Cash and Cash Equivalents and Restricted Cash Balances (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 110,756	$ 39,545	$ 110,756
Restricted cash included in other current assets	$ 2,505	$ 2,426
Restricted Cash and Cash Equivalents, Current, Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherCurrentAssetsMember	us-gaap:OtherCurrentAssetsMember
Cash, cash equivalents, and restricted cash shown in the statement of cash flows	$ 113,261	$ 41,971	$ 58,844	$ 62,004