Geographic Information and Major Customer and Product Data - Additional Information (Detail)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Revenue, Major Customer [Line Items]
Number of reportable segment	1
CDW Logistics [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	11.70%	6.30%
EMC Corporation [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue	5.50%	5.30%

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration