Stock Warrants - Warrant Activity (Details) - $ / shares	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Warrants And Rights Note Disclosure [Abstract]
Outstanding, beginning (in shares)	7,556,323
Granted (in shares)	0
Outstanding, ending (in shares)	7,556,323	7,556,323
Exercisable (in shares)	7,556,323
Outstanding, beginning, weighted average exercise price (in dollars per share)	$ 4.45
Granted, weighted average exercise price (in dollars per share)	0
Outstanding, ending, weighted average exercise price (in dollars per share)	4.45	$ 4.45
Exercisable, weighted average exercise price (in dollars per share)	$ 4.45
Outstanding, weighted average remaining contractual life (Year)	2 years 3 months 18 days	2 years 9 months 18 days
Exercisable, weighted average remaining contractual life (Year)	2 years 3 months 18 days