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Fair Value Measurements (Additional Information) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Jun. 30, 2015
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity $ 175  
Derivative Liabilities Noncurrent 174 $ 1,507
Derivative Liability, Current $ 1