Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Warrant Activity (Details)

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Warrants - Summary of Warrant Activity (Details) - shares
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Warrant [Member]    
Number of warrants outstanding, beginning 6,275,000 8,380,000
Number of warrants expired (1,994,000)
Number of warrants exercised (111,000)
Number of warrants outstanding, ending 6,275,000 6,275,000
January 2012 Warrants [Member] | Equity [Member]    
Number of warrants outstanding, beginning 650,000
Number of warrants expired (650,000)
Number of warrants exercised
Number of warrants outstanding, ending
Warrant expiration date Jan. 11, 2016  
March 2013 Warrants [Member] | Equity [Member]    
Number of warrants outstanding, beginning 455,000
Number of warrants expired (455,000)
Number of warrants exercised
Number of warrants outstanding, ending
Warrant expiration date Mar. 01, 2016  
April 2013 Warrants [Member] | Equity [Member]    
Number of warrants outstanding, beginning 1,500,000 1,500,000
Number of warrants expired
Number of warrants exercised
Number of warrants outstanding, ending 1,500,000 1,500,000
Warrant expiration date Apr. 25, 2018  
February 2012 Warrants [Member] | Liabilities [Member]    
Number of warrants outstanding, beginning 1,000,000
Number of warrants expired (889,000)
Number of warrants exercised (111,000)
Number of warrants outstanding, ending
Warrant expiration date Feb. 28, 2016  
October 2013 Warrants Series A [Member] | Liabilities [Member]    
Number of warrants outstanding, beginning 775,000 775,000
Number of warrants expired
Number of warrants exercised
Number of warrants outstanding, ending 775,000 775,000
Warrant expiration date Oct. 24, 2023  
January 2014 Warrants [Member] | Liabilities [Member]    
Number of warrants outstanding, beginning 4,000,000 4,000,000
Number of warrants expired
Number of warrants exercised
Number of warrants outstanding, ending 4,000,000 4,000,000
Warrant expiration date Jan. 16, 2024