Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Leases
Options to extend the leases			true
Options to terminate			true
Termination term			1 year
Current lease commitment liabilities	$ 4,848		$ 4,848		$ 5,664
Noncurrent lease commitment liabilities	7,665		7,665		10,088
Right-of-use asset	11,456		11,456		$ 13,683
Operating lease cost	$ 1,200	$ 1,700	$ 2,500	$ 3,400
Minimum
Leases
Remaining lease terms (in years)	1 year		1 year
Maximum
Leases
Remaining lease terms (in years)	7 years		7 years
Renewal term	5 years		5 years