INCOME TAXES (Schedule of Changes of Valuation Allowance) (Details) - Discontinued Operations [Member] - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Beginning balance	$ 41,316,449	$ 38,729,208	$ 42,362,849
Reversal	(12,515,962)	(24,771)	(932,833)
Foreign exchange effect	(1,738,223)	2,612,012	(2,700,808)
Ending Balance	$ 27,062,264	$ 41,316,449	$ 38,729,208

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset resulting from the effect of foreign exchange rates.

No definition available.

+ Details

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Namespace Prefix:	dq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Period Type:	instant

- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318

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