Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Share-based Compensation (Details)

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Summary of Significant Accounting Policies - Share-based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options excluded from calculation of dilutive shares as the effect would be anti-dilutive (in shares) 3,661,286 1,705,470 4,306,348 1,735,470
Stock-based compensation expense $ 391 $ 453 $ 758 $ 971
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-vested stock options unrecognized compensation expense $ 3,354   $ 3,354  
Non-vested stock options unrecognized compensation expense, weighted-average period of recognition     3 years