Accrued Liabilities (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Schedule of Accrued Liabilities [Line Items]
Royalties	$ 441,246	$ 239,129
Payroll	28,209	54,325
Interest	45,591
Miscellaneous	52,030	66,261
Total accrued liabilities	$ 567,076	$ 359,715	$ 275,608