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Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Amortizable intangible assets    
Finite-Lived Intangible Assets, Net $ 430 $ 591
Technology [Member]    
Amortizable intangible assets    
Finite-lived intangible assets, gross 6,745 6,745
Finite-Lived intangible assets, accumulated amortization (6,315) (6,154)
Finite-Lived Intangible Assets, Net $ 430 $ 591