Fair Value - Schedule of Assumptions to Estimate Fair Value of Warrants (Details) - $ / shares	2 Months Ended	6 Months Ended	12 Months Ended
	Mar. 08, 2019	Jun. 30, 2019	Dec. 31, 2018
Expected Dividend Rate [Member]
Fair value measurement, input Percentage		0.00%
August 2016 Warrants [Member]
Underlying price per share		$ 4.39	$ 7.92
August 2016 Warrants [Member] | Exercise Price Per Share [Member]
Fair value measurement, input per share		$ 82.50	$ 82.76
August 2016 Warrants [Member] | Risk Free Interest Rate [Member]
Fair value measurement, input Percentage		1.74%	2.47%
August 2016 Warrants [Member] | Expected Holding Period [Member]
Fair value measurement, input term		2 years 2 months 5 days	2 years 8 months 2 days
August 2016 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage		65.00%	70.00%
August 2016 Warrants [Member] | Expected Dividend Rate [Member]
Fair value measurement, input Percentage		0.00%	0.00%
February 2017 Warrants [Member]
Underlying price per share		$ 4.39	$ 7.92
February 2017 Warrants [Member] | Exercise Price Per Share [Member] | Minimum [Member]
Fair value measurement, input per share		30.25	30.36
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		1.71%	2.47%
February 2017 Warrants [Member] | Expected Holding Period [Member] | Minimum [Member]
Fair value measurement, input term		3 years 1 month 2 days	3 years 7 months 2 days
February 2017 Warrants [Member] | Expected Holding Period [Member] | Maximum [Member]
Fair value measurement, input term		3 years 4 months 6 days	3 years 7 months 6 days
February 2017 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage		70.00%	75.00%
February 2017 Warrants [Member] | Expected Dividend Rate [Member]
Fair value measurement, input Percentage		0.00%	0.00%
June 2017 Warrants [Member]
Underlying price per share		$ 4.39	$ 7.92
June 2017 Warrants [Member] | Exercise Price Per Share [Member]
Fair value measurement, input per share		$ 27.50	$ 27.72
June 2017 Warrants [Member] | Risk Free Interest Rate [Member]
Fair value measurement, input Percentage		1.71%	2.47%
June 2017 Warrants [Member] | Expected Holding Period [Member]
Fair value measurement, input term		2 years 8 months 5 days	3 years 5 months 1 day
June 2017 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage		0.00%	70.00%
June 2017 Warrants [Member] | Expected Dividend Rate [Member]
Fair value measurement, input Percentage		70.00%	0.00%
August 2017 Warrants [Member]
Underlying price per share		$ 4.39	$ 7.92
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		1.72%	2.46%
August 2017 Warrants [Member] | Expected Holding Period [Member]
Fair value measurement, input term			3 years 2 months 5 days
August 2017 Warrants [Member] | Expected Holding Period [Member] | Minimum [Member]
Fair value measurement, input term		2 years 8 months 5 days
August 2017 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage		70.00%	70.00%
August 2017 Warrants [Member] | Expected Dividend Rate [Member]
Fair value measurement, input Percentage		0.00%	0.00%
April 2018 Warrants [Member]
Underlying price per share		$ 4.39	$ 7.92
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]
Fair value measurement, input Percentage			2.51%
April 2018 Warrants [Member] | Risk Free Interest Rate [Member] | Minimum [Member]
Fair value measurement, input Percentage		1.74%
April 2018 Warrants [Member] | Risk Free Interest Rate [Member] | Maximum [Member]
Fair value measurement, input Percentage		1.87%
April 2018 Warrants [Member] | Expected Holding Period [Member] | Minimum [Member]
Fair value measurement, input term		1 year 3 months 26 days	1 year 9 months 25 days
April 2018 Warrants [Member] | Expected Holding Period [Member] | Maximum [Member]
Fair value measurement, input term		4 years 3 months 26 days	4 years 9 months 25 days
April 2018 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage			70.00%
April 2018 Warrants [Member] | Expected Volatility [Member] | Minimum [Member]
Fair value measurement, input Percentage		60.00%
April 2018 Warrants [Member] | Expected Volatility [Member] | Maximum [Member]
Fair value measurement, input Percentage		70.00%
April 2018 Warrants [Member] | Expected Dividend Rate [Member]
Fair value measurement, input Percentage		0.00%	0.00%
March 2019 Warrants [Member]
Underlying price per share	$ 6.60	$ 4.39
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	2.42%	1.75%
March 2019 Warrants [Member] | Expected Holding Period [Member]
Fair value measurement, input term	5 years	4 years 8 months 9 days
March 2019 Warrants [Member] | Expected Volatility [Member]
Fair value measurement, input Percentage	65.00%	70.00%
March 2019 Warrants [Member] | Expected Dividend Rate [Member]
Fair value measurement, input Percentage	0.00%	0.00%