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TriVascular Merger (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 03, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]          
Share price (in dollars per share) $ 7.42        
Net sales   $ 52,122 $ 38,231 $ 145,462 $ 114,380
TriVascular Technologies, Inc.          
Business Acquisition [Line Items]          
Equity consideration issued in merger (in shares) 13,586,503        
Equity consideration issued in merger $ 100,800        
Revision of net assets acquired and goodwill   205   27,201  
Adjustment to accounts receivable, increase   30   30  
Adjustment to accrued liabilities and other, increase   192   556  
Adjustment to inventories, increase (decrease)   (43)   219  
Adjustment to prepaid expenses and other current assets, increase       77  
Adjustment to intangible assets, decrease       26,971  
Adjustment to amortization of intangibles, decrease       266  
Gross contractual trade receivables 5,800        
Contractual cash flows not expected to be collected 200        
Intangible assets 46,200        
Net sales   $ 11,000   28,200  
TriVascular Technologies, Inc. | Cost of goods sold          
Business Acquisition [Line Items]          
Adjustment to amortization of intangibles, decrease       217  
TriVascular Technologies, Inc. | Marketing and sales          
Business Acquisition [Line Items]          
Adjustment to amortization of intangibles, decrease       $ 49  
TriVascular Technologies, Inc. | In-process research and development          
Business Acquisition [Line Items]          
Intangible assets 11,200        
TriVascular Technologies, Inc. | Customer relationships          
Business Acquisition [Line Items]          
Intangible assets $ 7,500        
Acquired intangible assets, useful life 10 years        
TriVascular Technologies, Inc. | Developed technology          
Business Acquisition [Line Items]          
Intangible assets $ 27,500        
Acquired intangible assets, useful life 11 years