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Fair Value Measurements - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Input	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Fair Value Disclosures [Abstract]
Number of inputs used for valuation of warrants | Input			6
Derivative warrant liability [Abstract]
Change in fair value of the warrant liability, net	$ (48)	$ 1,297	$ 161	$ 1,092
Derivative warrant liabilities	$ 761		$ 761		$ 225
Hypothetical change in market price of common shares (in hundredths)			10.00%
Impact of the hypothetical change in market price of common shares on derivative liability			$ 100

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The hypothetical change in market price of common shares during the period.

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The impact of the hypothetical change in market price of common shares on derivative liability during the period.

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Represents the number of inputs used for valuation of warrants.

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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 within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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