Income Taxes (Provision For (Benefit From) Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current
Federal									$ (40)	$ (18)	$ 45
State									154	202	112
Foreign									452	147	259
Total current provision									566	331	416
Deferred
Federal									6	27	0
State									0	0	0
Foreign									(72)	0	0
Total deferred provision (benefit)									(66)	27	0
Provision for (benefit from) income taxes	$ 128	$ 210	$ 92	$ 70	$ 281	$ 77	$ (78)	$ 78	$ 500	$ 358	$ 416