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Stock-Based Compensation - Stock Incentive Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Stock-Based Compensation:    
Shares reserved for issuance 1,400,000  
Shares available for future grant 203,202  
Stock-based compensation expense $ 0.8 $ 0.6