Summary Of Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Number of Shares
Beginning Balance	546,001	652,001
Granted	8,000	8,000
Exercised	(3,334)	(7,000)
Forfeited	(117,667)	(107,000)
Ending Balance	433,000	546,001
Exercisable	425,000	476,801
Options vested and expected to vest thereafter	433,000	546,001
Weighted Average Exercise Price
Beginning Balance	$ 4.54	$ 5.01
Granted	$ 1.80	$ 2.74
Exercised	$ 0.90	$ 0.82
Forfeited	$ 7.90	$ 7.54
Ending Balance	$ 3.60	$ 4.54
Exercisable	$ 3.64	$ 5.01
Options vested and expected to vest thereafter	$ 3.60	$ 4.54
Weighted-Average Remaining Contractual Term
Outstanding, end of period	2 years 4 months 24 days	2 years 9 months 18 days
Exercisable, end of period	2 years 3 months 18 days	2 years 8 months 12 days
Options vested and expected to vest thereafter	2 years 4 months 24 days	2 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding, end of period	$ 157,000	$ 202,800
Exercisable	155,000	131,000
Options vested and expected to vest thereafter	$ 157,000	$ 202,800