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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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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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