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Research and Development and Government and Industry Funded Contracts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Government and Industry Funded Contracts [Abstract]      
Research and development expense $ 173 $ 6,737 $ 3,554
DOE funding 821 1,375 1,756
Industry cost-share funding 0 0 277
Research and development expense, net (648) 5,362 1,521
Business Acquisition [Line Items]      
Asset impairment charges $ 520 2,087 $ 355
ADA Analytics Israel, LLC      
Business Acquisition [Line Items]      
Asset impairment charges   $ 1,900