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Acquisitions - Purchase Price Allocation (Argon Medical Devices, Inc.) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Business Acquisition [Line Items]          
Gain on bargain purchase   $ 669 $ 0 $ (11,574) $ 0
Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Cash and cash equivalents   1,436   1,436  
Trade receivables   8,351   8,351  
Inventories   11,671   11,671  
Prepaid expenses   1,275   1,275  
Property and equipment   2,319   2,319  
Deferred tax assets   184   184  
Total assets acquired   29,836   29,836  
Trade payables   (2,306)   (2,306)  
Accrued expenses   (5,083)   (5,083)  
Income taxes payable   (2)   (2)  
Deferred income tax liabilities - noncurrent   (771)   (771)  
Total liabilities assumed   (8,162)   (8,162)  
Total net assets acquired   21,674   21,674  
Gain on bargain purchase       (11,574)  
Total purchase price $ 10,100        
Provisional gain on bargain purchase   669      
Preliminary Allocation | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Cash and cash equivalents   1,436   1,436  
Trade receivables   8,351   8,351  
Inventories   12,217   12,217  
Prepaid expenses   1,275   1,275  
Property and equipment   2,667   2,667  
Deferred tax assets   184   184  
Total assets acquired   31,530   31,530  
Trade payables   (2,306)   (2,306)  
Accrued expenses   (5,083)   (5,083)  
Income taxes payable   (2)   (2)  
Deferred income tax liabilities - noncurrent   (999)   (999)  
Total liabilities assumed   (8,390)   (8,390)  
Total net assets acquired   23,140   23,140  
Gain on bargain purchase       (12,243)  
Total purchase price 10,897        
Adjustment | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Cash and cash equivalents   0   0  
Trade receivables   0   0  
Inventories   (546)   (546)  
Prepaid expenses   0   0  
Property and equipment   (348)   (348)  
Deferred tax assets   0   0  
Total assets acquired   (1,694)   (1,694)  
Trade payables   0   0  
Accrued expenses   0   0  
Income taxes payable   0   0  
Deferred income tax liabilities - noncurrent   228   228  
Total liabilities assumed   228   228  
Total net assets acquired   (1,466)   (1,466)  
Gain on bargain purchase       669  
Total purchase price $ (797)        
Developed technology | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   2,200   2,200  
Developed technology | Preliminary Allocation | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   2,600   2,600  
Developed technology | Adjustment | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   (400)   (400)  
Customer Lists | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   1,500   1,500  
Customer Lists | Preliminary Allocation | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   1,300   1,300  
Customer Lists | Adjustment | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   200   200  
Trademarks | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   900   900  
Trademarks | Preliminary Allocation | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   1,500   1,500  
Trademarks | Adjustment | Argon Medical Devices, Inc.          
Business Acquisition [Line Items]          
Intangibles   $ (600)   $ (600)