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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 172,865 $ 66,269 $ 40,394  
International 205 205 204  
Total $ 173,070 $ 66,474 $ 40,598 $ 18,106