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Cash, Cash Equivalents and Short-Term Investments (Tables) | 3 Months Ended
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Mar. 31, 2017
Cash, Cash Equivalents and Short-Term Investments [Abstract] |
Schedule of cash, cash equivalents and short-term investments |
|  | As of March 31, 2017 |  |  | As of December 31, 2016 |  |  | (Decrease) |
Cash and cash equivalents |  | $ | 4,252,020 |  |  | $ | 5,150,344 |  |  | $ | (898,324 | )
Short-term investments |  |  | 2,978,355 |  |  |  | 5,474,013 |  |  |  | (2,495,658 | )
Total |  | $ | 7,230,375 |  |  | $ | 10,624,357 |  |  | $ | (3,393,982 | )
Schedule of held to maturity securities |
|  | As of March 31, 2017 |  |  | As of December 31, 2016 |
Amortized cost |  | $ | 2,968,000 |  |  | $ | 5,450,000 |
Accrued interest |  |  | 10,355 |  |  |  | 24,013 |
Gross unrealized gains |  |  | 590 |  |  |  | 2,073 |
Gross unrealized losses |  |  | (27 | ) |  |  | (59 | )
Estimated fair value |  | $ | 2,978,918 |  |  | $ | 5,476,027 |

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