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Fair Value of Financial Instruments - Schedule of Cost, Fair Value and Maturities of Short Term Investments (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term investments - Cost | $ 15,607,812 | $ 14,228,126
Short-term investments - Fair Value | 15,702,388 | 14,257,998
Short-term investment maturities - Within 3 months, cost | 9,821,406 | 5,383,488
Short-term investment maturities - Between 3-12 months, cost | 5,786,406 | 8,844,638
Total, cost | 15,607,812 | 14,228,126
Short-term investment maturities - Within 3 months, fair value | 9,897,504 | 5,393,743
Short-term investment maturities - Between 3-12 months, fair value | 5,804,884 | 8,864,255
Total, fair value | 15,702,388 | 14,257,998
Corporate Debt Securities [Member] |  |
Short-term investments - Cost | 15,607,812 | 14,228,126
Short-term investments - Fair Value | $ 15,702,388 | $ 14,257,998

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