Segment Information - Product and Service and Product Group (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue from External Customer [Line Items]
Revenues	$ 77,584	$ 79,856	$ 153,071	$ 153,483
Hardware [Member]
Revenue from External Customer [Line Items]
Revenues	62,170	71,227	125,640	139,692
Software royalties and licenses [Member]
Revenue from External Customer [Line Items]
Revenues	7,162	4,508	11,413	5,991
Technical support services [Member]
Revenue from External Customer [Line Items]
Revenues	3,740	2,664	7,276	5,039
Engineering and other services [Member]
Revenue from External Customer [Line Items]
Revenues	4,512	1,457	8,742	2,761
ATCA Platforms [Member]
Revenue from External Customer [Line Items]
Revenues	36,518	22,891	74,181	50,460
Com Express and Rackmount Server [Member]
Revenue from External Customer [Line Items]
Revenues	11,931	14,124	24,103	27,041
Software and Solutions [Member]
Revenue from External Customer [Line Items]
Revenues	16,102	9,925	28,162	13,533
Other Products [Member]
Revenue from External Customer [Line Items]
Revenues	$ 13,033	$ 32,916	$ 26,625	$ 62,449