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Fair Value Measurements - Financial Instruments Measured On Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Fair value measurements      
Transfers between levels $ 0   $ 0
Premium conversion derivative 243 $ 345  
Recurring      
Fair value measurements      
Premium conversion derivative 243 345  
Total liabilities at Fair Value 243 345  
Recurring | Level 3      
Fair value measurements      
Premium conversion derivative 243 345  
Total liabilities at Fair Value 243 345  
Nonrecurring      
Fair value measurements      
Total liabilities at Fair Value $ 0 $ 0