Equity (Deficit) (Details) (USD $)	3 Months Ended	9 Months Ended		0 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 19, 2012 Registered offering	Sep. 19, 2012 Private placement Sentient	Sep. 19, 2012 Private placement Sentient Expected results
Common stock sold (in shares)				5,497,504
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Number of common shares that can be purchased upon exercise of warrant				2,748,752
Number of shares of common stock per capital unit (in shares)	1			1	1
Number of common shares which can be purchased with each warrant	0.5	0.5		0.50	0.50
Exercise price of warrants (in dollars per share)				$ 8.42	$ 8.42	$ 8.42
Term of warrants	5 years			5 years	5 years	5 years
Sale price (in dollars per shares)				$ 5.75	$ 5.4625
Offer price per unit to underwriter (in dollars per share)				$ 5.4625
Net proceeds from offering	$ 36,900,000	$ 36,891,000		$ 29,400,000	$ 7,500,000
Amount of underwriting discount and commission				1,600,000	400,000
Percentage of underwriting discount				5.00%
Amount of other offering costs				$ 600,000
Units issued (in shares)					1,365,794
Ownership interest in outstanding Common Stock (as a percent)					19.90%