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Summary of Significant Accounting Policies - Fair Value (Details) - Recurring - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Fair Value of Financial Measurements    
Available-for-sale securities $ 9,490,000 $ 9,698,000
Level 2    
Fair Value of Financial Measurements    
Available-for-sale securities $ 9,490,000 $ 9,698,000