Stockholders' Equity, Common Stock Purchase Warrants, and Noncontrolling Interest - Schedule of Outstanding Warrants to Purchase Common Stock (Details) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Common stock purchase warrants issued and outstanding	17,249,757	18,449,240
Weighted average exercise price per share	$ 1.68	$ 1.57
Series Z Warrants [Member]
Common stock purchase warrants issued and outstanding	16,814,939	16,815,039
Weighted average exercise price per share	$ 1.60	$ 1.60
Warrants expiration date	Apr. 30, 2024	Apr. 30, 2024
UPO - Series Z Warrants [Member]
Common stock purchase warrants issued and outstanding	53,000	53,000
Weighted average exercise price per share	$ 1.60	$ 1.60
Warrants expiration date	Jan. 31, 2022	Jan. 31, 2022
Series W Warrants [Member]
Common stock purchase warrants issued and outstanding	381,818	381,818
Weighted average exercise price per share	$ 5.00	$ 5.00
Warrants expiration date	Jan. 31, 2022	Jan. 31, 2022
Series S Warrants [Member]
Common stock purchase warrants issued and outstanding		1,199,383
Weighted average exercise price per share		$ 0.01
Warrants expiration date	Jun. 30, 2032	Jun. 30, 2032

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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