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Stockholders' Equity (Details 2)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Stockholders' Equity [Abstract]    
Risk-free interest rate 2.60% 1.90%
Dividend yield 0.00% 0.00%
Expected volatility 56.00% 61.00%
Expected life 5 years 4 months 24 days 6 years 6 months