Stock Option Activity under Plans (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012		Jun. 30, 2012		Jun. 30, 2011
Options Outstanding
Outstanding, beginning of period			1,153,741		1,177,642
Granted			421,500		45,500
Exercised	(128)		(5,328)
Forfeited/Canceled			(100,066)		(84,901)
Outstanding, end of period	1,469,847		1,469,847		1,138,241
Exercisable, end of period	828,899	[1]	828,899	[1]	706,350
Weighted Average Exercise Price
Weighted Average Exercise Price, beginning of period			$ 7.35		$ 7.57
Granted			$ 4.88		$ 4.34
Exercised			$ 3.16
Forfeited/Canceled			$ 7.50		$ 7.65
Weighted Average Exercise Price, end of period	$ 6.74		$ 6.74		$ 7.43
Options Exercisable, end of period	$ 8.55	[1]	$ 8.55	[1]	$ 9.72

[1] The weighted average remaining contractual life of the options that were exercisable as of June 30, 2012 was 4.56 years.