Commitments and Contingencies Related to Litigation (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended	36 Months Ended
	Sep. 30, 2009 patent	Sep. 30, 2011 lawsuit	Sep. 30, 2012 patent	Sep. 30, 2012 patent	Nov. 14, 2011
Commitments and Contingencies Disclosure [Abstract]
Number of patents in connection with patent infringement matters	10		6
Number of additional patents in connection with patent infringement matters				2
Number of withdrawn patents in connection with patent infringement matters			6
Number of lawsuits		2
Settlement agreement, amount agreed					$ 795