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Fair value of financial instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Apr. 26, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Derivative warrant - liability	$ 0		$ 7,166
Derivative warrant - liability, Carrying Value	0	1,680	7,166
Fair Value, Inputs, Level 1 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative warrant - liability	0		0
Fair Value, Inputs, Level 2 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative warrant - liability	0		0
Fair Value, Inputs, Level 3 [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative warrant - liability	$ 0		$ 7,166

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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