Equity Financings and Warrants (Details Textual) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Jun. 16, 2015	Feb. 07, 2014	Dec. 31, 2015	Dec. 31, 2014
Equity Financing And Warrants [Line Items]
Common stock, shares issued			9,051,217	3,021,498
Private Investment In Public Entity Transaction
Equity Financing And Warrants [Line Items]
Common stock, shares issued	6,003,082
Warrants available to purchase additional commons shares	2,401,233
Purchase price for common stock unit	$ 6.1635
Proceeds from the issuance of security units	$ 34.2
Warrants exercisable date			Dec. 13, 2015
Warrants were exercisable upon issuance, expiry date			Jun. 16, 2022
Warrant price per share	$ 6.1012
Private Investment In Public Entity Transaction | Security Units
Equity Financing And Warrants [Line Items]
Common stock, shares issued	6,003,082
Registered Direct Offering
Equity Financing And Warrants [Line Items]
Common stock, shares issued		730,890
Warrants available to purchase additional commons shares		182,722
Purchase price for common stock unit		$ 11.90
Proceeds from the issuance of security units		$ 7.9
Warrants were exercisable upon issuance, expiry date			Feb. 07, 2019
Warrant price per share			$ 14.875