Shareholders' Equity - Summary of Stock Option Activity under Plans (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of Shares, Beginning Balance	1,539,618	1,939,475
Weighted Average Exercise Price, Beginning Balance	$ 3.55	$ 4.49
Granted at fair value, Number of Shares	328,080	244,125
Exercised, Number of Shares	(31,925)	(90,786)
Forfeited, Number of Shares	(130,131)	(327,422)
Expired, Number of Shares	(190,021)	(225,774)
Number of Shares, Ending Balance	1,515,621	1,539,618	1,939,475
Vested and expected to vest, Number of Shares, Ending Balance	1,466,306
Exercisable, Number of Shares, Ending Balance	1,118,271
Granted at fair value, Weighted Average Exercise Price	$ 3.03	$ 3.27
Exercised, Weighted Average Exercise Price	$ 2.49	$ 2.41
Forfeited, Weighted Average Exercise Price	$ 3.23	$ 6.67
Expired, Weighted Average Exercise Price	$ 4.58	$ 7.24
Weighted Average Exercise Price, Ending Balance	$ 3.36	$ 3.55	$ 4.49
Vested and expected to vest, Weighted Average Exercise Price, Ending Balance	$ 3.36
Exercisable, Weighted Average Exercise Price, Ending Balance	$ 3.34
Weighted Average Remaining Contractual Life (in years)	3 years 11 months 5 days	4 years 2 months 27 days	4 years 3 months 29 days
Vested and expected to vest, Weighted Average Remaining Contractual Life (in years)	3 years 9 months 26 days
Exercisable, Weighted Average Remaining Contractual Life (in years)	2 years 8 months 23 days
Aggregate Intrinsic Value	$ 953,186
Vested and expected to vest, Aggregate Intrinsic Value	932,995
Exercisable, Aggregate Intrinsic Value	$ 784,434