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Stockholders' Equity (Details 1)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Stockholders' Equity [Abstract]      
Risk-free interest rate 2.80% 2.50% 1.90%
Dividend yield 0.00% 0.00% 0.00%
Expected volatility 55.00% 57.00% 61.00%
Expected life 6 years 6 months 6 years 6 months 6 years 6 months