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Stockholders' Equity (Details 2)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity [Abstract]    
Risk-free interest rate 2.59% 2.50%
Dividend yield 0.00% 0.00%
Expected volatility 51.00% 57.00%
Expected life 4 years 5 years 1 month 6 days