Cash, Cash Equivalents and Short-Term Investments (Details 1) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Schedule of fair value of held to maturity securities
Amortized cost		$ 5,450,000
Accrued interest		24,013
Gross unrealized gains		2,073
Gross unrealized losses		(59)
Estimated fair value		$ 5,476,027
(Decrease) increase amortized cost	(5,450,000)
(Decrease) increase accrued interest	(24,013)
(Decrease) increase gross unrealized gains	(2,073)
(Decrease) increase gross unrealized losses	59
(Decrease) increase estimated fair value	$ (5,476,027)