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Stock Warrants (Tables)
 6 Months Ended
Jun. 30, 2017
Stock Warrants [Line Items]  
Summary of stock warrant activities
   

Three months ended
June 30, 
2017

  
    Number    

Weight

average

exercise

price

  
Outstanding and exercisable at beginning of the period     820,312     $ 1.71  
Issued during the period     -       -  
Exercised during the period     -       -  
Cancelled or expired during the period     -       -  
Outstanding and exercisable at end of the period     820,312     $ 1.71  
Range of exercise price     $1.70 to $2.00
Date of Issuance August 27, 2014 to September 2, 2019 [Member]  
Stock Warrants [Line Items]  
Schedule fair value of warrants issued was estimated by using Binominal pricing model
Terms of warrants   5 years  
Expected volatility     72.0  
Risk-free interest rate     1.69  
Expected dividend yield     0.81
Date of Issuance September 3, 2014 to June 26, 2019 [Member]  
Stock Warrants [Line Items]  
Schedule fair value of warrants issued was estimated by using Binominal pricing model
Terms of warrants   4.81 years  
Expected volatility     69.8  
Risk-free interest rate     1.62  
Expected dividend yield     0.81