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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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The current amount of amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling three to twelve months.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling three months.

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