Accounting for Shared-Based Payments (Details 2) (USD $)	0 Months Ended	12 Months Ended
	Nov. 30, 2011	Dec. 31, 2010 Stock options Exercise price per Share 0.50 - 1.90	Dec. 31, 2009 Stock options Exercise price per Share 0.50 - 1.90	Dec. 31, 2010 Stock options Exercise price per share $1.40	Dec. 31, 2011 Stock options Exercise price per Share 3.35 - 4.30	Dec. 31, 2011 Stock options Exercise price per Share 0.50 - 1.40	Dec. 31, 2011 Stock options Exercise price per Share 0.50 - 4.30	Dec. 31, 2012 Stock options Exercise price per Share 3.40 - 5.20	Dec. 31, 2012 Stock options Exercise price per Share 3.40 - 4.38	Dec. 31, 2012 Stock options Exercise price per Share 0.50 - 5.20
Shared-based payments
Options outstanding (in shares)		4,302,008	2,107,008				5,964,039			9,734,268
Granted (in shares)				2,323,500	1,807,000			3,875,229
Forfeited (in shares)				(37,500)		(144,969)			(105,000)
Exercisable at the end of the period (in shares)										2,726,302
Exercise Price Per Share
Granted (in dollars per share)				$ 1.40
Forfeited (in dollars per share)				$ 1.40
Exercise price, low end of the range (in dollars per share)		$ 0.50	$ 0.50		$ 3.35	$ 0.50	$ 0.50	$ 3.40	$ 3.40	$ 0.50
Exercise price, high end of the range (in dollars per share)		$ 1.90	$ 1.90		$ 4.30	$ 1.40	$ 4.30	$ 5.20	$ 4.38	$ 5.20
Weighted average exercise price per share of outstanding options (in dollars per share)		$ 1.04	$ 0.61				$ 1.77			$ 2.75
Granted (in dollars per share)				$ 1.40	$ 3.50			$ 4.29
Forfeited (in dollars per share)				$ 1.40		$ 1.04			$ 4.10
Exercisable at the end of the period (in dollars per share)										$ 1.42
Intrinsic Value
Intrinsic value of options outstanding (in dollars)		$ 25,763,000	$ 22,320,000				$ 6,027,000			$ 24,482,000
Intrinsic value of options exercisable (in dollars)										10,464,000
Fair Value at the date of grant (in dollars)				$ 30,244,000
Reverse stock split ratio	0.5