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Stock Warrants (Details)
 6 Months Ended
Jun. 30, 2019
Date of Issuance September 3, 2014 to June 26, 2019 [Member]  
Stock Warrants [Line Items]  
Terms of warrants 4 years 9 months 22 days
Expected volatility 69.80%
Risk-free interest rate 1.62%
Expected dividend yield 0.81%
Date of Issuance August 27, 2014 to September 2, 2019 [Member]  
Stock Warrants [Line Items]  
Terms of warrants 5 years
Expected volatility 72.00%
Risk-free interest rate 1.69%
Expected dividend yield 0.81%