Restructuring Activities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
2019 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Percentage headcount reduction			6.00%
Restructuring related expenses	$ 0		$ 43
2018 Restructuring Plan [Member]
Restructuring Cost And Reserve [Line Items]
Percentage headcount reduction			13.00%
Restructuring related expenses		$ 66		$ 229