Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 17,238	$ 21,738
Total accumulated amortization—intangible assets	(12,019)	(14,934)
Total	5,219	6,804
Developed technology
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	13,418	13,418
Total accumulated amortization—intangible assets	(8,384)	(7,652)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	3,330	3,330
Total accumulated amortization—intangible assets	(3,170)	(2,837)
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	490	4,990
Total accumulated amortization—intangible assets	$ (465)	$ (4,445)