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CONSOLIDATED STATEMENTS OF CHANGES IN (DEFICIT) / EQUITY (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CONSOLIDATED STATEMENTS OF CHANGES IN (DEFICIT) / EQUITY      
Foreign currency translation adjustment, net of income taxes $ 0 $ 0 $ 0