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Fair Value of Financial Instruments - Schedule of Cost, Fair Value and Maturities of Short Term Investments (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term investments - Cost | $ 13,446,354 | $ 12,734,184
Short-term investments - Fair Value | 13,442,107 | 12,724,020
Short-term investment maturities - Within 3 months, cost | 4,241,961 |
Short-term investment maturities - Between 3-12 months, cost | 9,204,393 | 12,734,184
Total, cost | 13,446,354 | 12,734,184
Short-term investment maturities - Within 3 months, fair value | 4,244,210 |
Short-term investment maturities - Between 3-12 months, fair value | 9,197,897 | 12,724,020
Total, fair value | 13,442,107 | 12,724,020
Certificate of Deposit [Member] |  |
Short-term investments - Cost | 1,714,375 |
Short-term investments - Fair Value | 1,721,698 |
Corporate Debt Securities [Member] |  |
Short-term investments - Cost | 11,731,979 | 12,734,184
Short-term investments - Fair Value | $ 11,720,409 | $ 12,724,020

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