Information about Geographic Areas (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
Revenues by geographic area, based on billing location of customer
Revenues	$ 64,345	$ 34,197	$ 168,550	$ 88,894
North America [Member]
Revenues by geographic area, based on billing location of customer
Revenues	45,509	24,513	120,124	65,929
Europe [Member]
Revenues by geographic area, based on billing location of customer
Revenues	16,133	8,574	42,027	21,856
Asia Pacific and other [Member]
Revenues by geographic area, based on billing location of customer
Revenues	$ 2,703	$ 1,110	$ 6,399	$ 1,109

Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 38

-Subparagraph a(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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