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Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Income Statement [Abstract]        
Income (loss) from discontinued operations, income tax benefit $ 0 $ 0 $ 0 $ 0
Loss on disposal of discontinued operations, income tax provision $ 0 $ 0 $ 0 $ 0