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Significant accounting policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 item
Segment and geographic information
Number of operating segments	1
Number of geographic segments	1
Cash and cash equivalents
Cash equivalents	$ 13.3
Laboratory equipment
Property and equipment
Estimated useful life of the asset	5 years
Furniture
Property and equipment
Estimated useful life of the asset	5 years
Computer equipment
Property and equipment
Estimated useful life of the asset	3 years

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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