Fair Value - Schedule of Assumptions to Estimate Fair Value of Warrants (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2020 $ / shares	Dec. 31, 2019 $ / shares
August 2016 Warrants [Member]
Underlying price per share	$ 2.48	$ 0.54
August 2016 Warrants [Member] | Exercise Price Per Share [Member]
Fair value measurement, input per share	$ 82.50	$ 82.50
August 2016 Warrants [Member] | Risk Free Interest Rate [Member]
Fair value measurement, input Percentage	0.16	1.58
August 2016 Warrants [Member] | Expected Holding Period [Member]
Fair value measurement, input term	1 year 2 months 1 day	1 year 8 months 2 days
August 2016 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage	145	96
August 2016 Warrants [Member] | Expected Dividend Yield [Member]
Fair value measurement, input Percentage
February 2017 Warrants [Member]
Underlying price per share	$ 2.48	$ 0.54
February 2017 Warrants [Member] | Exercise Price Per Share [Member] | Minimum [Member]
Fair value measurement, input per share	30.25	30.25
February 2017 Warrants [Member] | Exercise Price Per Share [Member] | Maximum [Member]
Fair value measurement, input per share	$ 33.00	$ 33.00
February 2017 Warrants [Member] | Risk Free Interest Rate [Member]
Fair value measurement, input Percentage	0.16	1.60
February 2017 Warrants [Member] | Expected Holding Period [Member] | Minimum [Member]
Fair value measurement, input term	2 years 1 month 2 days	2 years 7 months 2 days
February 2017 Warrants [Member] | Expected Holding Period [Member] | Maximum [Member]
Fair value measurement, input term	2 years 1 month 6 days	2 years 7 months 6 days
February 2017 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage	115	89
February 2017 Warrants [Member] | Expected Dividend Yield [Member]
Fair value measurement, input Percentage
June 2017 Warrants [Member]
Underlying price per share	$ 2.48	$ 0.54
June 2017 Warrants [Member] | Exercise Price Per Share [Member]
Fair value measurement, input per share	$ 27.50	$ 27.50
June 2017 Warrants [Member] | Risk Free Interest Rate [Member]
Fair value measurement, input Percentage	.16	1.60
June 2017 Warrants [Member] | Expected Holding Period [Member]
Fair value measurement, input term	1 year 11 months 1 day	2 years 5 months 1 day
June 2017 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage	120	91
June 2017 Warrants [Member] | Expected Dividend Yield [Member]
Fair value measurement, input Percentage
August 2017 Warrants [Member]
Underlying price per share	$ 2.48	$ 0.54
August 2017 Warrants [Member] | Exercise Price Per Share [Member]
Fair value measurement, input per share	$ 19.80	$ 19.80
August 2017 Warrants [Member] | Risk Free Interest Rate [Member]
Fair value measurement, input Percentage	0.16	1.59
August 2017 Warrants [Member] | Expected Holding Period [Member]
Fair value measurement, input term	1 year 8 months 5 days	2 years 2 months 5 days
August 2017 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage	125	94
August 2017 Warrants [Member] | Expected Dividend Yield [Member]
Fair value measurement, input Percentage
April 2018 Warrants [Member]
Underlying price per share	$ 2.48	$ 0.54
April 2018 Warrants [Member] | Exercise Price Per Share [Member]
Fair value measurement, input per share	$ 17.16	$ 17.16
April 2018 Warrants [Member] | Risk Free Interest Rate [Member] | Minimum [Member]
Fair value measurement, input Percentage	0.17	1.59
April 2018 Warrants [Member] | Risk Free Interest Rate [Member] | Maximum [Member]
Fair value measurement, input Percentage	0.20	1.65
April 2018 Warrants [Member] | Expected Holding Period [Member] | Minimum [Member]
Fair value measurement, input term	3 months 26 days	9 months 25 days
April 2018 Warrants [Member] | Expected Holding Period [Member] | Maximum [Member]
Fair value measurement, input term	3 years 3 months 26 days	3 years 9 months 25 days
April 2018 Warrants [Member] | Expected Volatility [Member] | Minimum [Member]
Fair value measurement, input Percentage	100	86
April 2018 Warrants [Member] | Expected Volatility [Member] | Maximum [Member]
Fair value measurement, input Percentage	155	124
April 2018 Warrants [Member] | Expected Dividend Yield [Member]
Fair value measurement, input Percentage
March 2019 Warrants [Member]
Underlying price per share	$ 2.48	$ 0.54
March 2019 Warrants [Member] | Exercise Price Per Share [Member]
Fair value measurement, input per share	$ 8.80	$ 8.80
March 2019 Warrants [Member] | Risk Free Interest Rate [Member]
Fair value measurement, input Percentage	0.22	1.66
March 2019 Warrants [Member] | Expected Holding Period [Member]
Fair value measurement, input term	3 years 8 months 9 days	4 years 2 months 8 days
March 2019 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage	100	87
March 2019 Warrants [Member] | Expected Dividend Yield [Member]
Fair value measurement, input Percentage