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Derivative Financial Instruments (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Changes in derivative instrument liability
Balance at the beginning of the period	$ 172us-gaap_DerivativeLiabilitiesNoncurrent
Change in fair value of warrants during the quarter	268us-gaap_UnrealizedGainLossOnDerivatives	(223)us-gaap_UnrealizedGainLossOnDerivatives
Balance at the end of the period	440us-gaap_DerivativeLiabilitiesNoncurrent
Derivative instrument liability \| Warrants
Changes in warrants
Balance at the beginning of the period (in shares)	858,469
Balance at the end of the period (in shares)	858,469
Changes in derivative instrument liability
Balance at the beginning of the period	172
Change in fair value of warrants during the quarter	268
Balance at the end of the period	$ 440

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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