Expected Provision Obtained (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes Disclosure [Line Items]
Income tax at federal statutory rate, Amount	$ (3,091,483)	$ (1,619,000)
State tax provision, net of federal tax benefit	(530,499)	(278,000)
Nondeductible differences, Amount	1,122,878	(112,000)
Nonqualified stock option forfeitures, Amount	44,490	381,000
Tax credits, Amount	11,955	44,000
Change in valuation allowance, Amount	1,779,872	1,035,000
Expiration of net operating losses, Amount	650,958	633,000
Other, Amount	11,829	4,000
Provision for income taxes, Amount	$ 0	$ 0
Income tax at federal statutory rate, % of Pretax Income	34.00%	34.00%
State tax provision, net of federal tax benefit, % of Pretax Income	5.80%	5.80%
Nondeductible differences, % of Pretax Income	(4.50%)	2.30%
Nonqualified stock option forfeitures, % of Pretax Income	(0.5)	(8)
Tax credits, % of Pretax Income	(0.10%)	0.90%
Change in valuation allowance, % of Pretax Income	(27.70%)	(21.70%)
Expiration of net operating losses, % of Pretax Income	(7)	(13.3)
Other, % of Pretax Income	(0.10%)	0.00%
Provision for income taxes, % of Pretax Income	0.00%	0.00%