Accrued Liabilities (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Schedule of Accrued Liabilities [Line Items]
Royalties	$ 108,246	$ 351,846
Interest	171,794	0
Payroll	39,026	77,757
Miscellaneous	0	16,831
Total accrued liabilities	500,595	446,434
Redeemable Preferred Stock
Schedule of Accrued Liabilities [Line Items]
10% convertible preferred stock dividend	$ 181,529	$ 0