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Stockholders' Equity - Schedule of Fair Value of Stock Options Granted (Details)
6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Risk-free interest rate, minimum 2.60%
Risk-free interest rate, maximum 2.77%
Expected dividend yield 0.00%
Expected volatility, minimum 108.59%
Expected volatility, maximum 113.87%
Expected life 6 years