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Stock-Based Compensation (Details 3) - Restricted Stock Awards - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Number of Shares    
Unvested, December 31, 2018 900,000 0
Granted 0 2,500,000
Released (450,000) (1,600,000)
Unvested, March 31, 2019 450,000 900,000
Weighted Average Grant Date Fair Value    
Unvested, December 31, 2018 $ 0.19 $ 0.00
Granted 0 0.19
Released 0.19 0.19
Unvested, March 31, 2019 $ 0.19 $ 0.19
Omnibus Incentive Plan 2014    
Number of Shares    
Unvested, December 31, 2018 643,501 1,050,000
Granted   643,501
Released   (1,050,000)
Unvested, March 31, 2019   643,501
Weighted Average Grant Date Fair Value    
Unvested, December 31, 2018 $ 0.26 $ 0.75
Granted   0.26
Released   0.75
Unvested, March 31, 2019   $ 0.26