Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property and Equipment
Property and equipment, at cost	$ 31,786	$ 31,301
Accumulated depreciation and amortization	(23,198)	(20,538)
Property and equipment, net	8,588	10,763
Depreciation and amortization expense	3,100	2,800	$ 2,600
Software and other intangible assets	1,100	1,100
Technical equipment and computers
Property and Equipment
Property and equipment, at cost	$ 11,388	9,852
Technical equipment and computers | Minimum
Property and Equipment
Depreciable Life (In years)	3 years
Technical equipment and computers | Maximum
Property and Equipment
Depreciable Life (In years)	5 years
Leased assets
Property and Equipment
Property and equipment, at cost	$ 17,384	17,409
Leased assets | Minimum
Property and Equipment
Depreciable Life (In years)	3 years
Leased assets | Maximum
Property and Equipment
Depreciable Life (In years)	15 years
Furniture, fixtures and equipment
Property and Equipment
Property and equipment, at cost	$ 990	952
Furniture, fixtures and equipment | Maximum
Property and Equipment
Depreciable Life (In years)	5 years
Leasehold improvements
Property and Equipment
Property and equipment, at cost	$ 1,638	1,537
Leasehold improvements | Minimum
Property and Equipment
Depreciable Life (In years)	3 years
Leasehold improvements | Maximum
Property and Equipment
Depreciable Life (In years)	7 years
Construction-in-progress
Property and Equipment
Property and equipment, at cost	$ 386	$ 1,551