Segment Information - Product and Service and Product Group (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue from External Customer [Line Items]
Revenues	$ 65,438	$ 77,584	$ 133,616	$ 153,071
ATCA Platforms [Member]
Revenue from External Customer [Line Items]
Revenues	31,722	36,518	66,540	74,181
Software and Solutions [Member]
Revenue from External Customer [Line Items]
Revenues	12,612	16,102	24,261	28,162
Com Express and Rackmount Server [Member]
Revenue from External Customer [Line Items]
Revenues	14,218	11,931	28,845	24,103
Other Products [Member]
Revenue from External Customer [Line Items]
Revenues	$ 6,886	$ 13,033	$ 13,970	$ 26,625