Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 94,620	$ 82,352
Less accumulated depreciation	(51,099)	(45,766)	$ (43,202)
Property and equipment, net	43,521	36,586
Depreciation	6,725	7,608	$ 7,193
Hardware Revenue Generating Asset [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	11,300	7,734
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,828	3,828
Building and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	24,038	21,717
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	429	155
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	53,217	41,777
Office and computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,057	14,824
Motor vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 51	$ 51