Segment Information - Product and Service and Product Group (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenue from External Customer [Line Items]
Revenues	$ 63,725	$ 97,876	$ 216,796	$ 251,359
Hardware [Member]
Revenue from External Customer [Line Items]
Revenues	50,907	89,751	176,558	231,349
Software royalties and licenses [Member]
Revenue from External Customer [Line Items]
Revenues	5,904	3,543	17,317	9,534
Technical support services [Member]
Revenue from External Customer [Line Items]
Revenues	3,618	1,635	10,889	4,763
Engineering and other services [Member]
Revenue from External Customer [Line Items]
Revenues	3,296	2,947	12,032	5,713
ATCA Platforms [Member]
Revenue from External Customer [Line Items]
Revenues	27,687	44,928	101,869	95,198
Com Express and Rackmount Server [Member]
Revenue from External Customer [Line Items]
Revenues	13,861	16,846	37,963	43,947
Software and Solutions [Member]
Revenue from External Customer [Line Items]
Revenues	11,584	9,055	39,746	22,588
Other Products [Member]
Revenue from External Customer [Line Items]
Revenues	$ 10,593	$ 27,047	$ 37,218	$ 89,626