Litigation and Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2007	Dec. 31, 2006 regulator	Jun. 30, 2012 Selling, general and administrative [Member]	Dec. 31, 2012 Selling, general and administrative [Member]
Loss Contingencies [Line Items]
Nadatel purchased low-dropout voltage regulators	17,000	17,000
Settlement expense			$ 200	$ 200