Merck GHI Financing (Details Textual) - USD ($)		12 Months Ended
	Jul. 14, 2015	Dec. 31, 2016	Dec. 31, 2015
Common Stock and Note Purchase Agreement [Line Items]
Proceeds from issuance of common stock, net of issuance costs		$ 4,405,973	$ 17,366,620
Adjustments to additional paid in capital, stock issued, issuance costs			$ 58,566
Merck GHI Financing Agreement [Member]
Common Stock and Note Purchase Agreement [Line Items]
Stock issued during period, shares, new issues	1,136,364
Shares issued, price per share	$ 4.40
Proceeds from issuance of common stock, net of issuance costs	$ 5,000,000
Debt instrument, interest rate, stated percentage	8.00%
Debt instrument, face amount	$ 1,000,000
Fees related to common stock and debt transaction	50,000
Deferred debt issuance costs	8,000
Adjustments to additional paid in capital, stock issued, issuance costs	$ 42,000