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Summary of Significant Accounting Policies -Net Income (Loss) Per Share (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Income (Loss) Per Share        
Denominator for basic net income (loss) per share - weighted average shares 11,612,000 12,213,000 11,618,000 12,212,000
Effect of dilutive securities: Stock options and restricted stock units and awards   179,000   194,000
Denominator for diluted net income (loss) per share - weighted average shares 11,612,000 12,392,000 11,618,000 12,406,000
Stock Options        
Net Income (Loss) Per Share        
Options not included in computation because they were anti-dilutive   628,000   650,000
Weighted average exercise of price of options outstanding that were anti-dilutive   $ 3.79   $ 3.89