Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 12,971		$ 11,474
Accumulated depreciation - other	(7,120)		(6,584)
Property and equipment, net	5,851		4,890
Depreciation	539	$ 505
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	2,776		2,756
Technical equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	3,585		3,348
Facilities
Property, Plant and Equipment [Line Items]
Total property and equipment	3,629		3,621
Instruments
Property, Plant and Equipment [Line Items]
Total property and equipment	2,359		1,400
Capital projects in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 622		$ 349