Employee Stock Purchase Plan (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Share
Outstanding, beginning of period	2,302,000	2,228,067
Stock options granted	200,000	500
Stock options exercised	(2,000)	0
Restricted stock exercised	(2,500)	(2,500)
Canceled/Expired	(80,250)	(125,800)
Outstanding, end of period	2,417,250	2,100,267
Exercisable, end of period	1,443,075	1,393,217
Weighted Avg Exercise Price
Outstanding, beginning of period	$ 1.06	$ 1.14
Stock options granted	$ 0.29	$ 0.34
Stock options exercised	$ 0.12	$ 0
Restricted stock exercised	$ 0.00	$ 0.00
Canceled/Expired	$ 1.58	$ 0.59
Outstanding, end of period	$ 0.98	$ 1.17
Exercisable, end of period	$ 1.40	$ 1.50