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Summary of Significant Accounting Policies - AOCI (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity $ 1,731,753 $ 761,135 $ 659,693 $ 424,395
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity 317   208  
Unrealized loss on defined benefit plan, net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity (49)   (53)  
Accumulated other comprehensive income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total stockholders' equity $ 268 $ 215 $ 155 $ (22)