TriVascular Merger (Narrative) (Details) - USD ($)		3 Months Ended
	Feb. 03, 2016	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Share price (in dollars per share)	$ 7.42
Net sales		$ 42,366,000	$ 36,671,000
TriVascular Technologies, Inc.
Business Acquisition [Line Items]
Gross contractual trade receivables	$ 5,900,000
Contractual cash flows not expected to be collected	$ 300,000
Equity consideration issued in merger (in shares)	13,586,503
Equity consideration issued in merger	$ 100,800,000
Intangible assets	73,171,000
Net sales		$ 5,796
TriVascular Technologies, Inc. | In-process research and development
Business Acquisition [Line Items]
Intangible assets	20,900,000
TriVascular Technologies, Inc. | Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 10,500,000
Acquired intangible assets, useful life	10 years
TriVascular Technologies, Inc. | Developed technology
Business Acquisition [Line Items]
Intangible assets	$ 41,800,000
Acquired intangible assets, useful life	11 years