TriVascular Merger (Narrative) (Details) $ / shares in Units, $ in Millions	Feb. 03, 2016 USD ($) $ / shares shares
Business Acquisition [Line Items]
Share price (in dollars per share) | $ / shares	$ 7.42
TriVascular Technologies, Inc.
Business Acquisition [Line Items]
Equity consideration issued in merger (in shares) | shares	13,586,503
Equity consideration issued in merger | $	$ 100.8