Stockholders’ Equity - Common Stock Warrant Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Class of Warrant or Right
Outstanding warrants, beginning of period	43,757,379
Outstanding warrants, end of period	23,351,052
Warrant exercise price per share	$ 0.03	$ 0.24
Expiration Date - November 2017
Class of Warrant or Right
Exercised (1)	(20,406,327)
Warrant exercise price per share	$ 0.47