Accrued Liabilities (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Schedule of Accrued Liabilities [Line Items]
Royalties	$ 229,045	$ 351,846
Interest	181,509	0
Payroll	55,790	77,757
Miscellaneous	9,828	16,831
Total accrued liabilities	653,162	446,434
Redeemable Preferred Stock
Schedule of Accrued Liabilities [Line Items]
10% convertible preferred stock dividends	$ 176,990	$ 0