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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Warrant Activity

As of December 31, 2018, there were 36,267,329 warrants outstanding, with a weighted average exercise price of $0.79 per share, and annual expirations as follows:

 

Expiring in 2019     600,000  
Expiring in 2020     1,189,079  
Expiring in 2021     343,750  
Expiring in 2022     66,667  
Expiring in 2023     33,729,180  
Expiring thereafter     338,653  
      36,267,329