Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Warrants outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	1,826,608
Warrants expired (in shares)	(9)
Outstanding, end of period (in shares)	1,826,599	1,826,608
Warrants, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$ 23.04
Outstanding, end of period (in dollars per share)	$ 23.04	$ 23.04
Weighted average remaining life	4 years 8 months 12 days	5 years
Minimum [Member]
Warrants, Exercise Price per Share [Roll Forward]
Outstanding, (in dollars per share)	$ 7.00	$ 7.00
Maximum [Member]
Warrants, Exercise Price per Share [Roll Forward]
Outstanding, (in dollars per share)	$ 23.04	$ 23.04