Stock-Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 24, 2014	Sep. 30, 2015	Sep. 24, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, options outstanding	2,175,454		2,175,454
Common stock, options vested			1,628,609
Common stock, options unvested	546,845		546,845
Stock options exercised	18,340		863,247	739
Unrecognized compensation expense	$ 1,100,000		$ 1,100,000
Unrecognized compensation expense, recognition period			2 years 2 months 12 days
Stock-based compensation expense	$ 165,000	$ 297,000	$ 608,000	$ 635,000
Premium Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, options outstanding	1,739,367		1,739,367
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, options outstanding	12,352		12,352