Shelf Registration Statement (Details Textual) - USD ($) $ / shares in Units, shares in Thousands	Jun. 11, 2015	Apr. 23, 2015	Jun. 03, 2014
Stock Offering (Textual) [Abstract]
Aggregate value of securities permitted for issuance (up to $125 million)			$ 125,000,000
Cowen and Company | Equity Offering Sales Agreement under Shelf Registration Statement
Stock Offering (Textual) [Abstract]
Number of shares the Company may sell per equity offering sales agreement (up to $10 million)		$ 10,000,000.0
Percentage commission of gross proceeds		3.00%
Amount of common stock sold	$ 10,000,000
Common stock, shares issued	1,830
Average share price	$ 5.46
Proceeds from sale of common stock, net of offering costs	$ 9,600,000
Commissions and offering costs	$ 400,000