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Income Taxes - Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance [Line Items]    
Deferred tax assets, valuation allowance $ 6,678 $ 5,716
Increase in valuation allowance $ 1,000 $ 900