Details of Certain Financial Statement Components and Supplemental Disclosures of Cash Flow Information and Non-Cash Activities - Components of Accrued Expenses and Other Long Term Liabilities (Detail) - USD ($)	Jun. 27, 2015	Dec. 31, 2014	Jun. 28, 2014	Dec. 31, 2013
Accrued Liabilities and Other Liabilities [Abstract]
Salaries payable	$ 55,000	$ 130,000
Compensated absences	209,000	231,000
Compensation related	98,000	19,000
Warranty reserve	35,000	38,000	$ 142,000	$ 151,000
Deferred rent	134,000	368,000
Other	261,000	21,000
Fair value of warrant derivatives	1,543,000	5,228,000
Accrued Expenses and Other Long Term Liabilities	2,335,000	6,035,000
Less current portion	(646,000)	(1,401,000)
Long-term portion	1,689,000	4,634,000
Accrued Expenses and Other Long Term Liabilities	$ 2,335,000	$ 6,035,000