Significant Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jul. 02, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Letter of credit		$ 700
Cash and cash equivalents	$ 289,486		$ 389,705	$ 7,565	$ 6,285
Restricted Cash, Statement of Financial Position [Extensible Enumeration]	Other assets
Restricted cash included in other non-current assets	$ 698		0	0	0
Total presented in the condensed consolidated statements of cash flows	$ 290,184		$ 389,705	$ 7,565	$ 6,285

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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