Cash, Cash Equivalents and Short-Term Investments (Tables)

6 Months Ended

Jun. 30, 2017

Cash, Cash Equivalents and Short-Term Investments [Abstract]

Schedule of cash, cash equivalents and short-term investments

	As of June 30, 2017		As of December 31,  2016		(Decrease)
Cash and cash equivalents	$	3,847,632	$	5,150,344	$	(1,302,712	)
Short-term investments		489,582		5,474,013		(4,984,431	)
Total	$	4,337,214	$	10,624,357	$	(6,287,143	)

Schedule of held to maturity securities

	As of June 30, 2017		As of December 31, 2016
Amortized cost	$	487,000	$	5,450,000
Accrued interest		2,582		24,013
Gross unrealized gains		49		2,073
Gross unrealized losses		-		(59	)
Estimated fair value	$	489,631	$	5,476,027