Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Income Taxes (Textual) [Abstract]
Excess benefits due to stock option exercise	$ 900,000
State research and experimental tax credit carryforward	3,700,000
Change in amount of operating loss carryforwards valuation allowance	2,100,000	1,100,000
Undistributed earnings from non-U.S. operations	1,400,000
Maximum amount company recognize from unrecognized tax benefit	3,464,000	3,599,000	3,370,000	1,032,000
Unrecognized tax benefits that would impact effective tax rate if recognized	2,900,000
Subsequent Event [Member]
Income Taxes (Textual) [Abstract]
Research tax credit	500,000
Additional Paid-in Capital [Member]
Income Taxes (Textual) [Abstract]
State research and experimental tax credit carryforward	200,000
California Tax Authority
Income Taxes (Textual) [Abstract]
Operating loss carryforwards	27,300,000
California Tax Authority | Additional Paid-in Capital [Member]
Income Taxes (Textual) [Abstract]
Operating loss carryforwards	1,800,000
Foreign Tax Authority
Income Taxes (Textual) [Abstract]
Operating loss carryforwards	37,200,000
Foreign Tax Authority | Additional Paid-in Capital [Member]
Income Taxes (Textual) [Abstract]
Operating loss carryforwards	$ 1,700,000