Segment Information - Product and Service and Product Group (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Revenue from External Customer [Line Items]
Revenues	$ 68,178	$ 75,487
ATCA Platforms [Member]
Revenue from External Customer [Line Items]
Revenues	34,818	37,672
Software and Solutions [Member]
Revenue from External Customer [Line Items]
Revenues	11,649	12,060
Com Express and Rackmount Server [Member]
Revenue from External Customer [Line Items]
Revenues	14,627	13,150
Other Products [Member]
Revenue from External Customer [Line Items]
Revenues	$ 7,084	$ 12,605

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration