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Fair Value Measurements (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Liabilities    
Amount transferred from Level 1 to Level 2 $ 0 $ 0
Amount transferred from Level 2 to Level 1 0 0
Amount transferred from Level 1 to Level 2 0 0
Amount transferred from Level 2 to Level 1 0 0
Amount transferred into Level 3 0 0
Amount transferred out of Level 3 0 0
Amount transferred into Level 3 0 0
Amount transferred out of Level 3 0 0
Recurring | Measured at fair value    
Assets    
Cash and cash equivalents 26,850,000 37,495,000
Liabilities    
Warrant liability 12,347,000 11,286,000
Recurring | Measured at fair value | Quoted prices in active markets (Level 1)    
Assets    
Cash and cash equivalents 26,850,000 37,495,000
Recurring | Measured at fair value | Significant unobservable inputs (Level 3)    
Liabilities    
Warrant liability $ 12,347,000 $ 11,286,000