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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement Of Stockholders Equity [Abstract]      
Stock-based compensation tax benefit   $ 24 $ 18
Stock-based compensation tax expense $ 24