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Summary of Significant Accounting Policies - (Details) - Employee Stock Option [Member]
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
Options not included in computation because they were anti-dilutive | shares 613,000
Weighted average exercise of price of options outstanding that were anti-dilutive | $ / shares $ 3.79