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Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Liabilities:    
Liability $ 0  
Recurring | Measured at fair value    
Assets:    
Cash Equivalents 17,005 $ 13,506
Total assets at fair value 17,005 13,506
Liabilities:    
Total liabilities at fair value   108
Recurring | Measured at fair value | Warrants    
Liabilities:    
Liability   108
Recurring | Measured at fair value | Level 1    
Assets:    
Cash Equivalents 17,005 13,506
Total assets at fair value $ 17,005 13,506
Recurring | Measured at fair value | Level 3 | Warrants    
Liabilities:    
Liability   $ 108