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Significant Accounting Policies - Restructuring Activities (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
position
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Accounting Policies [Abstract]                      
Restructuring expenses $ 0 $ 108 $ 70 $ 1,077 $ 2,088 $ 24,127 $ 0 $ 0 $ 1,255 $ 26,215 $ 0
Severance costs                   20,000  
Other related costs                   $ 6,000  
Number of positions eliminated | position                 165    
Number of positions eliminated, percent                 9.00%