Industry and geographic information (Details Textual) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Gsk [Member]	Dec. 31, 2011 Gsk [Member]	Dec. 31, 2010 Gsk [Member]
Entity-Wide Revenue, Major Customer, Percentage					63.00%	67.00%	46.00%
Revenues	$ 560	$ 560	$ 26,314	$ 33,209

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463

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