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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