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Fair Value of Financial Instruments - Schedule of Cost, Fair Value and Maturities of Short Term Investments (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term investments - Cost | $ 18,558,771 | $ 12,734,184
Short-term investments - Fair Value | 18,579,731 | 12,724,020
Short-term investment maturities - Within 3 months, cost | 5,714,421 |
Short-term investment maturities - Between 3-12 months, cost | 12,844,350 | 12,734,184
Total, cost | 18,558,771 | 12,734,184
Short-term investment maturities - Within 3 months, fair value | 5,724,554 |
Short-term investment maturities - Between 3-12 months, fair value | 12,855,177 | 12,724,020
Total, fair value | 18,579,731 | 12,724,020
Certificate of Deposit [Member] |  |
Short-term investments - Cost | 3,128,390 |
Short-term investments - Fair Value | 3,144,875 |
Corporate Debt Securities [Member] |  |
Short-term investments - Cost | 15,430,381 | 12,734,184
Short-term investments - Fair Value | $ 15,434,856 | $ 12,724,020

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