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Stock Warrants (Tables) | 3 Months Ended
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Mar. 31, 2018
Stock Warrants [Line Items] |
Summary of stock warrant activities |
|  | Three Months Ended March 31, 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

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