Public Offering of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 13, 2015	Feb. 05, 2015	Jun. 30, 2015	Dec. 31, 2014
Public Offering of Common Stock
Offering, issuance and sale of common shares under Underwriting Agreement		4,728,000
Par value of common stock		$ 0.01	$ 0.01
Shares of common stock sold	5,437,200		24,932,392	19,488,814
Public offering price (in dollars per share)	$ 2.75	$ 2.75
Number of days to underwriter to sell additional common shares		30 days
Additional Common Shares to cover over-allotments		709,200
Gross proceeds from issuance of common stock	$ 15.0
Underwriting discounts, commissions and other estimated offering expenses	$ 1.4