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Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments (Tables) | 9 Months Ended
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Sep. 30, 2016
Cash, Cash Equivalents, Short-Term Investments and Long-Term Investments [Abstract] |
Schedule of cash, cash equivalents and short-term investments and long-term investments |
|  | As of September 30, 2016 |  |  | As of December 31, 2015 |  |  | Increase (Decrease) |
Cash and cash equivalents |  | $ | 4,408,415 |  |  | $ | 1,573,328 |  |  | $ | 2,835,087 |
Short-term investments(1) |  |  | 5,199,000 |  |  |  | 4,464,000 |  |  |  | 735,000 |
Subtotal |  |  | 9,607,415 |  |  |  | 6,037,328 |  |  |  | 3,570,087 |
Long-term investments (1) |  |  | 0 |  |  |  | 487,000 |  |  |  | (487,000 | )
Total |  | $ | 9,607,415 |  |  | $ | 6,524,328 |  |  | $ | 3,083,087 |
(1) We accrued $20,065 and $9,221 in interest income on these investments as of September 30, 2016 and December 31, 2015, respectively, which was recorded in other receivables.
Schedule of held to maturity securities |
|  |  |  |  | Gross Unrealized |  |  |  |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Estimated Fair Value |
Certificates of deposit |  | $ | 5,199,000 |  |  | $ | 5,642 |  |  | $ | 0 |  |  | $ | 5,204,642 |

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