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Investment in Sales-Type Leases, Net (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Investments [Abstract]
Sale leaseback transaction lease, Terms		BMPG systems to Pucheng (Phase I and II, 15 and 11 year terms, respectively)
Transfer agreement, description	The ownership of Pucheng systems was transferred to Pucheng in January 2020 as a result of receiving full payment from Pucheng by Xi’an TCH.

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- Definition

Transfer agreement, descriptions.

+ References

No definition available.

+ Details

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- References

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- Definition

A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77913982&loc=d3e50796-112755

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888430&loc=SL77919786-209982

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