Stockholders’ Equity - Common Stock Warrants (Details) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Class of Warrant or Right
Number of Warrants	23,351,052	43,757,379
Warrant exercise price per share	$ 0.03	$ 0.24
Expiration Date - May 2018
Class of Warrant or Right
Number of Warrants	1,200,000	21,606,327
Warrant exercise price per share	$ 0.47	$ 0.47
Expiration Date - May 2020
Class of Warrant or Right
Number of Warrants	15,816,327	15,816,327
Warrant exercise price per share	$ 0.01	$ 0.01
Expiration Date - September 2020
Class of Warrant or Right
Number of Warrants	4,175,975	4,175,975
Warrant exercise price per share	$ 0.01	$ 0.01
Expiration Date - February 2021
Class of Warrant or Right
Number of Warrants	2,158,750	2,158,750
Warrant exercise price per share	$ 0.01	$ 0.01