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Summary of Significant Accounting Policies - Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents and restricted cash
Cash and cash equivalents	$ 212,835	$ 160,358
Restricted cash	2,498	2,498
Total	215,333	$ 162,856	$ 38,806
Letter of credit	$ 2,500

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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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