Stockholders' Equity - Warrants Outstanding and Exercisable for the Purchase of Common Stock (Details)	Dec. 31, 2016 $ / shares shares
Class of Warrant or Right
Shares | shares	51,709,460
Weighted Average Exercise Price Per Share | $ / shares	$ 0.31
Warrant Expiration of November 9, 2017
Class of Warrant or Right
Shares | shares	7,252,081
Weighted Average Exercise Price Per Share | $ / shares	$ 0.70
Warrant Expiration of May 7, 2018
Class of Warrant or Right
Shares | shares	22,306,327
Weighted Average Exercise Price Per Share | $ / shares	$ 0.47
Warrant Expiration of May 7, 2020
Class of Warrant or Right
Shares | shares	15,816,327
Weighted Average Exercise Price Per Share | $ / shares	$ 0.01
Warrant Expiration of September 30, 2020
Class of Warrant or Right
Shares | shares	4,175,975
Weighted Average Exercise Price Per Share | $ / shares	$ 0.01
Warrant Expiration of February 10, 2021
Class of Warrant or Right
Shares | shares	2,158,750
Weighted Average Exercise Price Per Share | $ / shares	$ 0.01