Restructuring Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Activity in accrued restructuring expense
Accrued restructuring, beginning of the period		$ 282
Provision for restructuring charges		579
Cash payments		(442)
Accrued restructuring, end of the period	$ 419	419
Termination of certain employees and exit of an office facility
Activity in accrued restructuring expense
Accrued restructuring, beginning of the period	642
Cash payments	(223)
Accrued restructuring, end of the period	$ 419	$ 419