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Restructurings (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]            
Restructuring expense         $ 592  
2020 Restructuring Plan [Member]            
Restructuring Cost and Reserve [Line Items]            
Reduction in workforce 4.00%          
Restructuring expense     $ 0 $ 398 $ 592 $ 398
2019 Restructuring Plan [Member]            
Restructuring Cost and Reserve [Line Items]            
Reduction in workforce   2.00%