Accrued Liabilities (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Schedule of Accrued Liabilities [Line Items]
Royalties	$ 351,846	$ 239,129
Payroll	77,757	54,325
Sales tax payable	0	29,112
Insurance premiums payable		20,320
Miscellaneous	16,831	16,829
Total accrued liabilities	$ 446,434	$ 359,715