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Cash, Cash Equivalents and Short-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash, Cash Equivalents and Short-Term Investments [Abstract] |
Schedule of cash, cash equivalents and short-term investments |
|  | As of December 31, 2017 |  |  | As of December 31, 2016 |
Cash and cash equivalents |  | $ | 3,798,811 |  |  | $ | 5,150,344 |
Short-term investments |  |  | - |  |  |  | 5,474,013 |
Total |  | $ | 3,798,811 |  |  | $ | 10,624,357 |
Schedule of held to maturity securities |
|  | As of December 31, 2017 |  |  | As of December 31, 2016 |
Amortized cost |  | $ | - |  |  | $ | 5,450,000 |
Accrued interest |  |  | - |  |  |  | 24,013 |
Gross unrealized gains |  |  | - |  |  |  | 2,073 |
Gross unrealized losses |  |  | - |  |  |  | (59 | )
Estimated fair value |  | $ | - |  |  | $ | 5,476,027

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