Balance Sheet Account Detail (Goodwill and Intangible Assets) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Goodwill	[1]	$ 120,711	$ 28,685
Intangible assets (excluding goodwill), net		84,511	42,118
Developed technology
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Finite lived intangibles	[1]	67,600	40,100
Accumulated amortization		(3,810)	(690)
Finite lived intangibles, net		63,790	39,410
Customer relationship
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Finite lived intangibles	[1]	7,500	0
Accumulated amortization		(687)	0
Finite lived intangibles, net		6,813	0
Trademarks and trade names
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived intangibles		2,708	2,708
In-process research and development
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]
Indefinite lived intangibles	[1]	$ 11,200	$ 0

[1] Difference in the value between these dates is mainly due to acquisition of TriVascular. Refer to Note 13 of the consolidated financial statements for further discussion.