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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]        
Discontinued operation, tax effect of discontinued operation $ 0 $ 0 $ 0 $ 0
Discontinued operation, tax effect of gain (loss) from disposal of discontinued operation $ 0 $ 0 $ 0 $ 0