Employee Stock Purchase Plan (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share
Outstanding, beginning of period	2,302,000	2,228,067
Stock options granted	200,000	81,000
Stock options exercised	(252,000)	0
Restricted stock exercised	(2,500)	(2,500)
Canceled/Expired	(644,350)	(475,800)
Outstanding, end of period	1,603,150	1,830,767
Exercisable, end of period	668,700	1,397,767
Weighted Avg Exercise Price
Outstanding, beginning of period	$ 1.06	$ 1.14
Stock options granted	$ 0.29	$ 0.45
Stock options exercised	$ 0.32	$ 0
Restricted stock exercised	$ 0.00	$ 0.00
Canceled/Expired	$ 1.08	$ 0.55
Outstanding, end of period	$ 1.07	$ 1.27
Exercisable, end of period	$ 2.07	$ 1.49