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Cash, Cash Equivalents and Short-Term Investments (Details 1) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Schedule of fair value of held to maturity securities |  |
Amortized cost |  | $ 5,450,000
Accrued interest |  | 24,013
Gross unrealized gains |  | 2,073
Gross unrealized losses |  | (59)
Estimated fair value |  | $ 5,476,027
(Decrease) increase amortized cost | (5,450,000) |
(Decrease) increase accrued interest | (24,013) |
(Decrease) increase gross unrealized gains | (2,073) |
(Decrease) increase gross unrealized losses | 59 |
(Decrease) increase estimated fair value | $ (5,476,027) |

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