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Stock Warrants (Tables)
 6 Months Ended
Jun. 30, 2018
Stock Warrants [Line Items]  
Summary of stock warrant activities
  

Three Months Ended

June 30,

2018

 
  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