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Payables to former subsidiaries, net (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Proceeds on disposal of patented proprietary technology offset against amount due to a former subsidiary	$ 2,845,795
Gain on disposal of patented proprietary technology		$ 12,118,675
Bak Shenzhen [Member]
Proceeds on disposal of patented proprietary technology offset against amount due to a former subsidiary	12,845,795
BAK Shenzhen [Member] | RMB [Member]
Gain on disposal of patented proprietary technology	$ 85,100,000

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Amount of gain (loss) on sale or disposal of intangible assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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