Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Shareholders Equity Warrants Outstanding (Details)

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Stockholders' Equity - Summary of Shareholders Equity Warrants Outstanding (Details) - Warrants [Member] - shares
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Stock Holders Equity [Line Items]    
Total Warrants Outstanding, beginning 5,958,000 40,255,000
Warrants tendered on January 13, 2017   (30,966,000)
Warrants exercised first quarter (2,916,000)
Warrants exercised second quarter (412,000)
Warrants exercised third quarter  
Warrants exercised fourth quarter   (3,000)
Warrants issued second quarter 240,000  
Total Warrants Outstanding, ending 6,198,000 [1] 5,958,000
[1] Weighted average of exercise price for outstanding warrants is $ 0.70