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Warrants - Schedule of Warrants Outstanding (Details) - $ / shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Number of Shares Underlying Warrants	22,902,240	19,323,195
Warrant One [Member]
Warrants, Issue Date	Apr. 20, 2020
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.55
Warrants, Expiration Date	Apr. 20, 2022
Number of Shares Underlying Warrants	4,787,553
Warrant Two [Member]
Warrants, Issue Date	Apr. 20, 2020
Warrants, Classification	Equity
Warrants, Exercise Price	$ 2.0888
Warrants, Expiration Date	Apr. 20, 2022
Number of Shares Underlying Warrants	311,191
Warrant Three [Member]
Warrants, Issue Date	Apr. 08, 2019
Warrants, Classification	Equity
Warrants, Exercise Price	$ 0.01
Number of Shares Underlying Warrants		670,000
Warrant Four [Member]
Warrants, Issue Date	Apr. 08, 2019
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.35
Warrants, Expiration Date	Apr. 08, 2024
Number of Shares Underlying Warrants	11,692,518	12,266,665
Warrant Five [Member]
Warrants, Issue Date	Apr. 08, 2019
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.6875
Warrants, Expiration Date	Apr. 03, 2024
Number of Shares Underlying Warrants	797,334	797,334
Warrant Six [Member]
Warrants, Issue Date	Feb. 12, 2019
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.8313
Warrants, Expiration Date	Feb. 07, 2024
Number of Shares Underlying Warrants	110,922	110,922
Warrant Seven [Member]
Warrants, Issue Date	Feb. 12, 2019
Warrants, Classification	Equity
Warrants, Exercise Price	$ 1.34
Warrants, Expiration Date	Aug. 12, 2024
Number of Shares Underlying Warrants	1,433,447	1,706,484
Warrant Eight [Member]
Warrants, Issue Date	Feb. 04, 2019
Warrants, Classification	Equity
Warrants, Exercise Price	$ 2.125
Warrants, Expiration Date	Jan. 30, 2024
Number of Shares Underlying Warrants	34,605	34,605
Warrant Nine [Member]
Warrants, Issue Date	Jan. 31, 2019
Warrants, Classification	Equity
Warrants, Exercise Price	$ 2.125
Warrants, Expiration Date	Jan. 26, 2024
Number of Shares Underlying Warrants	10,151	10,151
Warrant Ten [Member]
Warrants, Issue Date	Dec. 03, 2018
Warrants, Classification	Equity
Warrants, Exercise Price	$ 3.90
Warrants, Expiration Date	Jun. 03, 2024
Number of Shares Underlying Warrants	937,500	937,500
Warrant Eleven [Member]
Warrants, Issue Date	Apr. 03, 2018
Warrants, Classification	Equity
Warrants, Exercise Price	$ 7.50
Warrants, Expiration Date	Apr. 03, 2023
Number of Shares Underlying Warrants	2,350,011	2,350,011
Warrant Twelve [Member]
Warrants, Issue Date	Apr. 04, 2018
Warrants, Classification	Equity
Warrants, Exercise Price	$ 7.50
Warrants, Expiration Date	Apr. 04, 2023
Number of Shares Underlying Warrants	115,000	115,000
Warrant Thirteen [Member]
Warrants, Issue Date	Aug. 31, 2015
Warrants, Classification	Equity
Warrants, Exercise Price	$ 118.00
Warrants, Expiration Date	Aug. 31, 2020
Number of Shares Underlying Warrants	3,000	3,000
Warrant Fourteen [Member]
Warrants, Issue Date	Jun. 15, 2015
Warrants, Classification	Equity
Warrants, Exercise Price	$ 75.50
Warrants, Expiration Date, Description	Five years after milestone achievement
Number of Shares Underlying Warrants	319,008	319,008
Warrant Fifteen [Member]
Warrants, Issue Date	Jun. 15, 2015
Warrants, Classification	Equity
Warrants, Exercise Price	$ 83.50
Warrants, Expiration Date	Jun. 16, 2020
Number of Shares Underlying Warrants		2,515

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+ References

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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-Name Accounting Standards Codification
-Topic 505
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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