Risks and Uncertainties (Details) (Customers)	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Accounts receivable | Low end of range
Risks and uncertainties
Threshold percentage for disclosure of customer concentration risk	10.00%
Accounts receivable | Edom Technology
Risks and uncertainties
Concentrations of credit risk (as a percent)	29.00%	11.00%
Accounts receivable | Avnet
Risks and uncertainties
Concentrations of credit risk (as a percent)	13.00%	18.00%
Accounts receivable | Macnica
Risks and uncertainties
Concentrations of credit risk (as a percent)		14.00%
Accounts receivable | Macnica | High end of range
Risks and uncertainties
Concentrations of credit risk (as a percent)	10.00%
Revenue | Low end of range
Risks and uncertainties
Threshold percentage for disclosure of customer concentration risk	10.00%
Revenue | Edom Technology
Risks and uncertainties
Concentrations of credit risk (as a percent)	24.00%	28.00%	27.00%
Revenue | Avnet
Risks and uncertainties
Concentrations of credit risk (as a percent)	12.00%	14.00%	10.00%
Revenue | Macnica
Risks and uncertainties
Concentrations of credit risk (as a percent)	10.00%
Revenue | Macnica | High end of range
Risks and uncertainties
Concentrations of credit risk (as a percent)		10.00%	10.00%
Revenue | Samsung
Risks and uncertainties
Concentrations of credit risk (as a percent)	13.00%		16.00%
Revenue | Samsung | High end of range
Risks and uncertainties
Concentrations of credit risk (as a percent)		10.00%