Segment Information - Geographical Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Product revenue	$ 21,128	$ 71,410
Service revenue	37,903	34,139
Total revenue	59,031	105,549
Government Contracts Concentration Risk [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	34,200	52,700
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Product revenue	13,315	33,878
Service revenue	26,561	24,270
Total revenue	39,876	58,148
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Product revenue	7,813	37,532
Service revenue	11,342	9,869
Total revenue	$ 19,155	$ 47,401
Revenue [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		33.00%
Revenue [Member] | Australia and the UK
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	36.00%