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TriVascular Merger (Assets and Liabilities Acquired) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Feb. 03, 2016
Jan. 01, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill $ 93,731   $ 28,685 $ 28,685
TriVascular Technologies, Inc.        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 24,012    
Short-term investments   3,008    
Accounts receivable   5,563    
Inventories   17,546    
Prepaid expenses and other current assets   1,818    
Property and equipment   3,152    
Intangible assets   73,171    
Other assets   317    
Accounts payable   (2,214)    
Accrued liabilities and other   (5,811)    
Notes payable   (61)    
Net assets acquired   120,501    
Goodwill   64,989    
Total preliminary purchase consideration   $ 185,490