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Fair Value Measurements (Details 2) - Warrant obligation [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Beginning, Balance $ 0 $ 0 $ 1,255
Gain for expiration of the warrant included in earnings (1,255)
Ending, Balance $ 0 $ 0 $ 0