Summary of Information About Options Outstanding and Exercisable (Detail) (USD $)	12 Months Ended
	Dec. 27, 2014
$0.83 - $3.00
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]
Range of Exercise Prices, Minimum	$ 0.83
Range of Exercise Prices, Maximum	$ 3.00
Options Outstanding	2,715,238
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	2 years 8 months 27 days
Options Outstanding, Weighted Average Exercise Price	$ 1.42
Options Exercisable	2,220,878
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	2 years 5 months 5 days
Options Exercisable, Weighted Average Exercise Price	$ 1.33
$3.01 - $5.12
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]
Range of Exercise Prices, Minimum	$ 3.01
Range of Exercise Prices, Maximum	$ 5.12
Options Outstanding	1,456,050
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	2 years 11 months 1 day
Options Outstanding, Weighted Average Exercise Price	$ 4.37
Options Exercisable	1,399,176
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	2 years 10 months 24 days
Options Exercisable, Weighted Average Exercise Price	$ 4.39
$5.13 (option exchange)
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]
Range of Exercise Prices, Minimum	$ 5.13
Options Outstanding	301,034
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	2 years 5 months 12 days
Options Outstanding, Weighted Average Exercise Price	$ 5.13
Options Exercisable	301,034
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	2 years 5 months 12 days
Options Exercisable, Weighted Average Exercise Price	$ 5.13
$5.14 - $8.00
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]
Range of Exercise Prices, Minimum	$ 5.14
Range of Exercise Prices, Maximum	$ 8.00
Options Outstanding	3,331,826
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	6 years 4 months 2 days
Options Outstanding, Weighted Average Exercise Price	$ 5.73
Options Exercisable	1,998,492
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	4 years 7 months 21 days
Options Exercisable, Weighted Average Exercise Price	$ 6.05
$8.01 - $11.27
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]
Range of Exercise Prices, Minimum	$ 8.01
Range of Exercise Prices, Maximum	$ 11.27
Options Outstanding	798,478
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	1 year 18 days
Options Outstanding, Weighted Average Exercise Price	$ 10.19
Options Exercisable	798,478
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	1 year 18 days
Options Exercisable, Weighted Average Exercise Price	$ 10.19
$0.83 - $11.27
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding By Exercise Price [Line Items]
Range of Exercise Prices, Minimum	$ 0.83
Range of Exercise Prices, Maximum	$ 11.27
Options Outstanding	8,602,626
Options Outstanding, Weighted Average Remaining Contractual Life (in years)	4 years
Options Outstanding, Weighted Average Exercise Price	$ 4.53
Options Exercisable	6,718,058
Options Exercisable, Weighted Average Remaining Contractual Life (in years)	3 years 7 days
Options Exercisable, Weighted Average Exercise Price	$ 4.60