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TriVascular Merger (Assets and Liabilities Acquired) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Feb. 03, 2016
Business Acquisition [Line Items]      
Goodwill $ 120,927 $ 120,711  
TriVascular Technologies, Inc.      
Business Acquisition [Line Items]      
Cash and cash equivalents     $ 24,012
Short-term investments     3,008
Accounts receivable     5,780
Inventories     17,765
Prepaid expenses and other current assets     1,895
Property and equipment     3,152
Intangible assets     46,200
Other assets     317
Accounts payable     (2,214)
Accrued liabilities and other     (6,450)
Notes payable     (61)
Net assets acquired     93,404
Goodwill     92,086
Total preliminary purchase consideration     $ 185,490