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, 2019
Dec. 31, 2018
Stock Holders Equity [Line Items]    
Outstanding, beginning 5,799,000 [1] 5,958,000 [2]
Issued 240,000
Exercised
Tendered
Expired (399,000)
Outstanding, ending [1] 5,799,000 5,799,000
[1] Weighted average exercise price for outstanding warrants is $0.61.
[2] Weighted average exercise price for outstanding warrants is $0.70.