Stockholders' Equity - Schedule of Warrants (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Warrants
Balance of warrants outstanding at the beginning of the period (in shares)	3,649,341	322,774
Granted (in shares)	7,437,454	3,450,000
Exercised (in shares)	(497,313)	(74,518)
Expired (in shares)		(48,915)
Balance of warrants outstanding at the end of the period (in shares)	10,589,482	3,649,341	322,774
Weighted-Average Exercise Price Per Share
Weighted average exercise price of warrants at the beginning of the period (in dollars per share)	$ 8.91	$ 68.07
Granted (in dollars per share)	1.87	6.60
Exercised (in dollars per share)	6.60	21.60
Expired (in dollars per share)		217.17
Weighted average exercise price of warrants at the end of the period (in dollars per share)	$ 4.08	$ 8.91	$ 68.07
Weighted-Average Remaining Contractual Term
Weighted-Average Remaining Contractual Term	3 years 8 months 1 day	4 years 4 months 21 days	4 years 4 months 21 days