Convertible Preferred Stock and Stock Warrants (Details) (USD $)	0 Months Ended				3 Months Ended		12 Months Ended
	Jun. 14, 2012	Feb. 04, 2011	Jan. 06, 2011	Aug. 12, 2009	Mar. 31, 2013 payment	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011 payment
Class of Warrant or Right [Line Items]
Issuance of cumulative convertible preferred stock and warrants				16,000
Issue price of cumulative convertible preferred stock and warrants				$ 1,000
Issuance of detachable warrants to acquire common stock				155
Issuance of detachable Contingent Warrants to acquire common stock				500
Proceeds from host contract				68.00%
Net proceeds from host contract				$ 10,800,000
Fair value of the detachable warrants				5,200,000
Beneficial conversion discount associated with preferred stock				5,200,000
Conversion period, in months				36 months
Preferred Stock
Convertible Preferred Stock shares issued upon conversion		434.782			434.782
Conversion price of convertible preferred stock					$ 2.30
Cumulative convertible preferred stock, liquidation preference					$ 1,000
Dividends accrued, liquidation preference annual payment rate			15.00%		15.00%
Number of quarterly dvidend payments					8			8
Criteria for availing obligation to pay dividend for the shareholders					Previously paid an amount at least eight quarterly dividends
Conversion of preferred stock into common stock, shares								4,871,719
Preferred stock dividends, value of common stock per share		$ 91.67
Common Stock Price Per Share		$ 6.63	$ 4.81
Prior business days for volume-weighted average price per share		10 days	10 days
Stock Warrants
Change in fair value of warrant liability					0	(3,875,000)	2,600,000
Revalued warrant liability	$ 14,000,000
Number of warrants exercisable					1,544,250
Exercisable [Member]
Class of Warrant or Right [Line Items]
Exercise price of the exercisable warrants				2.31
Contingent [Member]
Class of Warrant or Right [Line Items]
Exercise price of the exercisable warrants				2.45
Expected term				5 years
Volatility rate	58.10%			54.00%
Risk-free return rate	0.36%			2.70%
Expected dividend rate	0.00%			0.00%
Exercisable and Contingent [Member]
Class of Warrant or Right [Line Items]
Exercise price of the exercisable warrants					1.21