Note 16. Subsequent Events (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012	Dec. 31, 2009	Sep. 30, 2009
Proceeds from Warrant Exercises (in Dollars)	$ 300,000	$ 10,106,557	$ 428,337
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		3,804,868	156,866	0	51,370
Proceeds from Issuance of Common Stock (in Dollars)			48,082,025	2,484,536
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)		3.37	3.15	5.24		5.24	5.24
Conversion of Stock, Shares Issued	81,100
Subsequent Event [Member] | ATM Shares [Member]
Stock Offering (in Dollars)		25,000,000
Stock Issued During Period, Shares, New Issues		5,381,670
Proceeds from Issuance of Common Stock (in Dollars)		6,800,000
Commission Percent		3.00%
Other Commitment (in Dollars)		50,000
Subsequent Event [Member] | Series A Preferred Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		6,036,219
Stock Issued During Period, Shares, New Issues		15,000.00422
Preferred Stock, Dividend Rate, Percentage		0.00%
Proceeds from Issuance of Preferred Stock and Preference Stock (in Dollars)		15,000,000
Convertible Preferred Stock, Shares Issued upon Conversion		12,072,438
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)		1.18
Conversion of Stock, Shares Issued		8,018,112
Conversion of Stock, Shares Converted		9,963
Subsequent Event [Member]
Proceeds from Warrant Exercises (in Dollars)		400,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		120,516
License and Services Revenue (in Dollars)		$ 5,000,000
Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage			8.00%