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Intangible Assets (Company's Intangible Assets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Cost $ 56,271 $ 56,271
Accumulated Amortization 4,824 4,140
Fusion Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 9,242 9,242
Accumulated Amortization 3,235 2,773
Clamp and Probe Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 829 829
Accumulated Amortization 829 829
SUBTLE Access Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost 2,179 2,179
Accumulated Amortization 760 538
IPR&D [Member]    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 44,021 $ 44,021