Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Commitments And Contingencies Disclosure [Line Items]
Rent expense	$ 225,000	$ 200,000	$ 446,000	$ 509,000
Percentage of minimum royalty payment			0.13%
Percentage of maximum royalty payment			2.50%
Royalty expenses totaled	$ 6,000	$ 4,000	$ 12,000	$ 10,000
Minimum [Member]
Commitments And Contingencies Disclosure [Line Items]
Royalty obligations terminate at various times			2013
Maximum [Member]
Commitments And Contingencies Disclosure [Line Items]
Royalty obligations terminate at various times			2020
Santa Barbara [Member]
Commitments And Contingencies Disclosure [Line Items]
Lease facility expires in			2016-11
Renewal period of operating lease			5 years
Number of five-year renewal options			1
Austin, Texas [Member]
Commitments And Contingencies Disclosure [Line Items]
Lease facility expires in			2017-03
Renewal period of operating lease			5 years
Number of five-year renewal options			1