Warrants - Schedule of Fair Value of Warrants Classified as Liabilities (Details) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
October 2013 Warrants [Member]
Strike price	$ 15.00	$ 15.00
October 2013 Warrants [Member] \| Expected Dividend Yield [Member]
Fair value assumptions, percentage	0.00%	0.00%
October 2013 Warrants [Member] \| Contractual Term [Member]
Fair value assumptions, term	4 years 7 months 6 days	5 years 7 months 6 days
October 2013 Warrants [Member] \| Cumulative Volatility [Member]
Fair value assumptions, percentage	88.49%	86.73%
October 2013 Warrants [Member] \| Risk Free Interest Rate [Member]
Fair value assumptions, percentage	2.20%	2.59%
January 2014 Warrants [Member]
Strike price	$ 15.00	$ 15.00
January 2014 Warrants [Member] \| Expected Dividend Yield [Member]
Fair value assumptions, percentage	0.00%	0.00%
January 2014 Warrants [Member] \| Contractual Term [Member]
Fair value assumptions, term	4 years 9 months 18 days	5 years 9 months 18 days
January 2014 Warrants [Member] \| Cumulative Volatility [Member]
Fair value assumptions, percentage	88.65%	87.08%
January 2014 Warrants [Member] \| Risk Free Interest Rate [Member]
Fair value assumptions, percentage	2.20%	2.61%