Property, Plant and Equipment, net Narrative (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
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, net	$ 13,206		$ 13,206		$ 14,985
Depreciation expense	1,799	$ 3,586	3,807	$ 6,850
Amount capitalized to internal use software	943	984	2,153	1,896
Property, plant, and equipment, excluding internal-use software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	21,637		21,637		21,596
Less: Accumulated depreciation and amortization	(17,526)		(17,526)		(17,078)
Property, plant, and equipment, net	4,111		4,111		4,518
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	12,325		12,325		12,144
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	2,179		2,179		2,292
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	7,133		7,133		7,160
Internal-use software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	34,034		34,034		33,278
Construction in progress - Internal-use software	3,970		3,970		2,973
Less: Accumulated depreciation and amortization	(28,909)		(28,909)		(25,784)
Property, plant, and equipment, net	9,095		9,095		$ 10,467
Depreciation expense	$ 1,421	$ 2,401	$ 3,056	$ 4,948