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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair value measurements
Derivative liabilities related to Warrants	$ 172us-gaap_DerivativeLiabilitiesNoncurrent	$ 1,534us-gaap_DerivativeLiabilitiesNoncurrent
Derivative instrument liability \| Warrants
Fair value measurements
Derivative liabilities related to Warrants	172	1,534	5,258	3,325
Fair value on a recurring basis \| Significant Unobservable Inputs (Level 3) \| Derivative instrument liability \| Warrants
Fair value measurements
Derivative liabilities related to Warrants	172	1,534
Fair value on a recurring basis \| Total Fair Value \| Derivative instrument liability \| Warrants
Fair value measurements
Derivative liabilities related to Warrants	$ 172	$ 1,534

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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