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Income Taxes - Uncertain Tax Positions (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Liability for uncertain tax positions    
Balance at the beginning of the period $ 486,000 $ 458,000
Increases due to current year positions 18,000 5,000
Increases due to interest 24,000 23,000
Balance at the end of the period $ 528,000 $ 486,000