Equity (Details) (USD $)	12 Months Ended		0 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Sep. 19, 2012 Registered offering	Sep. 19, 2012 Private placement Sentient
Common stock sold (in shares)			5,497,504
Units issued (in shares)				1,365,794
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Number of common shares that can be purchased upon exercise of warrant			2,748,752
Sale price (in dollars per shares)			$ 5.75	$ 5.4625
Number of shares of common stock per capital unit (in shares)			1	1
Number of common shares which can be purchased with each warrant			0.50	0.50
Exercise price of warrants (in dollars per share)			$ 8.42	$ 8.42
Term of warrants			5 years	5 years
Offer price per unit to underwriter (in dollars per share)			$ 5.4625
Percentage of underwriting discount			5.00%
Net proceeds from offering	$ 36,908,000		$ 29,400,000	$ 7,500,000
Amount of underwriting discount and commission			1,600,000	400,000
Amount of other offering costs			$ 600,000
Ownership interest in outstanding Common Stock (as a percent)				19.90%