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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator used in basic and diluted earnings per share:      
Net income attributable to Daqo New Energy Corp. ordinary shareholders from continuing operations $ 129,336 $ 28,263 $ 61,155
(Loss) income from discontinued operations, net of tax (141) 1,261 (23,030)
Net income attributable to Daqo New Energy Corp. ordinary shareholders-basic and diluted $ 129,195 $ 29,524 $ 38,125
Denominator used in basic and diluted earnings per share:      
Weighted average number of ordinary shares outstanding used in computing earnings per share-basic 355,087,013 339,571,054 311,715,158
Weighted average number of ordinary shares outstanding used in computing earnings per share-diluted 375,017,150 349,961,558 325,506,335
Basic earnings per share-continuing operations $ 0.36 $ 0.08 $ 0.20
Basic earnings (loss) per share-discontinued operations 0.00 0.01 (0.08)
NET INCOME ATTRIBUTABLE TO DAQO NEW ENERGY CORP. PER ORDINARY SHARE-Basic 0.36 0.09 0.12
Diluted earnings per share-continuing operations 0.34 0.08 0.19
Diluted earnings (loss) per share-discontinued operations 0.00 0.00 (0.07)
NET INCOME ATTRIBUTABLE TO DAQO NEW ENERGY CORP. PER ORDINARY SHARE-Diluted $ 0.34 $ 0.08 $ 0.12
Employee Stock Option [Member]      
Denominator used in basic and diluted earnings per share:      
Dilutive effects of RSUs 4,421,397 5,568,144 6,346,349
Restricted Stock Units (RSUs) [Member]      
Denominator used in basic and diluted earnings per share:      
Dilutive effects of RSUs 15,508,740 4,822,360 7,444,828