Employee Benefit Plan and Non-Qualified Stock Option and Compensation Plan (Common Stock Purchase Options, 2008 Long Term Incentive Plan) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Number of options
Exercised (with delivery of shares)	(10,000)
Total Addtions/deductions	2,580,726
2008 Long-Term Incentive Plan [Member]
Number of options
Beginning Balance	12,205,717	7,793,989	4,083,100
Granted	2,707,336	6,211,354	4,644,883
Exercised (with delivery of shares)	(10,000)	(431,972)	(510,095)
Forfeitures (Pre-vesting)	(65,553)	(1,042,071)	(391,618)
Expirations (Post-vesting)	(51,057)	(281,667)	(3,000)
Exchanged for Cashless exercise		43,916	29,281
Ending Balance	14,786,443	12,205,717	7,793,989
Average Exercise Price
Beginning Balance	$ 2.15	$ 2.03	$ 1.35
Granted	$ 1.16	$ 2.24	$ 2.52
Exercised (with delivery of shares)	$ 0.56	$ 1.00	$ 1.14
Forfeitures (Pre-vesting)	$ 1.00	$ 2.29	$ 1.64
Expirations (Post-vesting)	$ 2.04	$ 2.23	$ 0.82
Exchanged for cashless exercise	$ 0.00	$ 1.66	$ 1.24
Ending Balance	$ 1.97	$ 2.15	$ 2.03
Initial Fair Market Value
Beginning Balance	$ 15,316,144	$ 10,195,479	$ 5,002,238
Granted	1,555,431	7,382,599	6,312,781
Exercised (with delivery of shares)	(5,596)	(403,382)	(626,179)
Forfeitures (Pre-vesting)	(65,734)	(1,404,105)	(458,144)
Expirations (Post-vesting)	(104,347)	(398,199)	(2,076)
Exchanged for Cashless exercise		(56,248)	(33,141)
Ending Balance	$ 16,695,898	$ 15,316,144	$ 10,195,479