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Segment reporting and concentrations (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 15,440	$ 15,746	$ 16,160	$ 16,903	$ 18,977	$ 19,710	$ 22,768	$ 25,136	$ 64,249	$ 86,591	$ 73,942
UNITED STATES
Segment Reporting Information [Line Items]
Revenues									41,616	65,533	51,626
NETHERLANDS
Segment Reporting Information [Line Items]
Revenues									9,163	7,658	7,850
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues									8,128	8,529	9,721
Other - principally Europe [Member]
Segment Reporting Information [Line Items]
Revenues									$ 5,342	$ 4,871	$ 4,745

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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=26872669&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

+ Details

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X

- Details

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