Property, Plant and Equipment, net Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, net	$ 13,755		$ 14,985
Depreciation expense	2,008	$ 3,264
Amount capitalized to internal use software	1,210	912
Property, plant, and equipment, excluding internal-use software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	21,535		21,596
Less: Accumulated depreciation and amortization	(17,375)		(17,078)
Property, plant, and equipment, net	4,160		4,518
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	12,144		12,144
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	2,224		2,292
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	7,135		7,160
Construction in progress - PPE
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	32		0
Internal-use software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment	33,738		33,278
Construction in progress - Internal-use software	3,344		2,973
Less: Accumulated depreciation and amortization	(27,487)		(25,784)
Property, plant, and equipment, net	9,595		$ 10,467
Depreciation expense	$ 1,635	$ 2,547