Stockholders' Equity - Common Stock Warrants (Details) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Class of Warrant or Right
Number of Warrants	2,765,044	2,768,882
Warrant exercise price per share	$ 0.08	$ 0.08
Expiration Date - May 2020
Class of Warrant or Right
Number of Warrants	1,977,041	1,977,041
Warrant exercise price per share	$ 0.08
Expiration Date - September 2020
Class of Warrant or Right
Number of Warrants	521,997	521,997
Warrant exercise price per share	$ 0.08
Expiration Date - February 2021
Class of Warrant or Right
Number of Warrants	266,006	269,844
Warrant exercise price per share	$ 0.08