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Fair Value Measurements - Financial Instruments Measured On Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair value measurements      
Transfers between levels $ 0 $ 0  
Premium conversion derivative   345  
Recurring      
Fair value measurements      
Premium conversion derivative   345  
Total liabilities at Fair Value 0 345  
Recurring | Level 3      
Fair value measurements      
Premium conversion derivative   345  
Total liabilities at Fair Value   345  
Nonrecurring      
Fair value measurements      
Total liabilities at Fair Value $ 0 $ 0 $ 0