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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Recognized income tax benefit (provision) $ 0 $ 0 $ 0 $ 0