Summary of Significant Accounting Policies - Total Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended	6 Months Ended
Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Cost of revenue	$ 1,000	$ 3,000	$ 1,000	$ 8,000
Research and development	45,000	77,000	100,000	178,000
Selling, general and administrative	83,000	158,000	194,000	373,000
Total stock-based compensation expense	$ 129,000	$ 238,000	$ 295,000	$ 559,000

- Definition

The costs incurred in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept.

+ References+ Details