Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 12,974		$ 12,974		$ 11,474
Accumulated depreciation	(7,531)		(7,531)		(6,584)
Property and equipment, net	5,443		5,443		4,890
Depreciation	533	$ 540	1,100	$ 1,000
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	2,801		2,801		2,756
Technical equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	3,550		3,550		3,348
Facilities
Property, Plant and Equipment [Line Items]
Total property and equipment	3,620		3,620		3,621
Instruments
Property, Plant and Equipment [Line Items]
Total property and equipment	2,283		2,283		1,400
Capital projects in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 720		$ 720		$ 349