Industry and geographic information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue:
Revenues	$ 26,101	$ 32,600	$ 37,094
United Kingdom and Ireland [Member]
Revenue:
Revenues	15,967	17,619	16,641
USA [Member]
Revenue:
Revenues	3,890	3,694	3,929
France [Member]
Revenue:
Revenues	2,930	1,763	2,425
Europe [Member]
Revenue:
Revenues	$ 3,313	$ 9,524	$ 14,098

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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

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