Capital Structure - Common Stock and Common Stock Purchase Warrants - Summary of Outstanding Warrants (Details)	6 Months Ended
	Jun. 30, 2018 $ / shares shares
Number of Shares | shares	145,197,204
Exercise Price Lower Limit	$ 0.01
Exercise Price Upper Limit	$ 15
Remaining Life (years)	0 years
Third Quarter 2018 [Member]
Number of Shares | shares	250,000
Exercise Price Upper Limit	$ 1.50
Remaining Life (years)	2 months 30 days
Fourth Quarter 2018 [Member]
Number of Shares | shares	6,089,166
Exercise Price Lower Limit	$ 1.00
Exercise Price Upper Limit	$ 1.50
Remaining Life (years)	6 months
First Quarter 2019 [Member]
Number of Shares | shares	4,024,000
Exercise Price Lower Limit	$ 0.50
Exercise Price Upper Limit	$ 2.00
Remaining Life (years)	9 months
Second Quarter 2019 [Member]
Number of Shares | shares	135,000
Exercise Price Lower Limit	$ 0.07
Exercise Price Upper Limit	$ 0.23
Remaining Life (years)	1 year
Third Quarter 2019 [Member]
Number of Shares | shares	260,000
Exercise Price Lower Limit	$ 0.50
Exercise Price Upper Limit	$ 1.50
Remaining Life (years)	1 year 2 months 30 days
Fourth Quarter 2019 [Member]
Number of Shares | shares	22,690,908
Exercise Price Lower Limit	$ 0.05
Exercise Price Upper Limit	$ 3.74
Remaining Life (years)	1 year 6 months
Second Quarter 2020 [Member]
Number of Shares | shares	300,000
Exercise Price Upper Limit	$ 0.50
Remaining Life (years)	2 years
Fourth Quarter 2020 [Member]
Number of Shares | shares	1,000,000
Exercise Price Upper Limit	$ 0.20
Remaining Life (years)	2 years 6 months
First Quarter 2021 [Member]
Number of Shares | shares	12,600,000
Exercise Price Upper Limit	$ 0.20
Remaining Life (years)	2 years 9 months
Second Quarter 2021 [Member]
Number of Shares | shares	5,812,252
Exercise Price Lower Limit	$ 0.01
Exercise Price Upper Limit	$ 0.20
Remaining Life (years)	3 years
Third Quarter 2021 [Member]
Number of Shares | shares	5,016,667
Exercise Price Lower Limit	$ 0.03
Exercise Price Upper Limit	$ 0.20
Remaining Life (years)	3 years 2 months 30 days
Second Quarter 2022 [Member]
Number of Shares | shares	1,750,000
Exercise Price Upper Limit	$ 0.15
Remaining Life (years)	4 years
Third Quarter 2022 [Member]
Number of Shares | shares	2,650,000
Exercise Price Lower Limit	$ 0.05
Exercise Price Upper Limit	$ 0.10
Remaining Life (years)	4 years 2 months 30 days
Fourth Quarter 2022 [Member]
Number of Shares | shares	9,811,422
Exercise Price Lower Limit	$ 0.08
Exercise Price Upper Limit	$ 0.29
Remaining Life (years)	4 years 6 months
First Quarter 2023 [Member]
Number of Shares | shares	6,000,000
Exercise Price Lower Limit	$ 0.01
Exercise Price Upper Limit	$ 0.03
Remaining Life (years)	4 years 9 months
Second Quarter 2023 [Member]
Number of Shares | shares	15,000,000
Exercise Price Lower Limit	$ 0.01
Exercise Price Upper Limit	$ 0.20
Remaining Life (years)	5 years
First Quarter 2024 [Member]
Number of Shares | shares	30,000,000
Exercise Price Upper Limit	$ 0.01
Remaining Life (years)	5 years 9 months
Second Quarter 2032 [Member]
Number of Shares | shares	21,807,789
Exercise Price Lower Limit	$ 0.01
Exercise Price Upper Limit	$ 0.07
Remaining Life (years)	14 years