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Description of business and basis of presentation (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Forward Purchase Contracts [Member]
Changes in fair value of Level 3 financial assets and liabilities
Beginning Balance	$ 744
Issuance		1,080
Adjustments to fair value included in other income	12,347	12,011
Transfers to additional paid-in-capital	(13,091)	(13,091)
Warrant Liability [Member]
Changes in fair value of Level 3 financial assets and liabilities
Beginning Balance	(7,915)
Issuance		(7,631)
Adjustments to fair value included in other income	2,993	2,709
Ending Balance	$ (4,922)	$ (4,922)

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- Definition

Amount of gain (loss) recognized in other comprehensive income, arising from financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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- Definition

Amount of settlements that have taken place in relation to financial instruments classified in shareholders' equity measured at fair value and categorized within level 3 of the fair value hierarchy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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- Definition

Amount of transfers into financial instruments classified in shareholders' equity measured at fair value and categorized within level 3 of the fair value hierarchy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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- Definition

Amount of financial instruments classified in shareholders' equity, measured at fair value using significant unobservable inputs (Level 3), which is required for reconciliation purposes of beginning and ending balances.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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