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Shareholders' Equity - 2012 Equity Incentive Plan Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Class of Stock [Line Items]        
Noncash share-based compensation $ 891 $ 913 $ 2,744 $ 2,343
Stock options and Restricted stock units | 2012 Equity Incentive Plan        
Class of Stock [Line Items]        
Vesting period for stock options and restricted stock units     4 years 4 years
Expiration period for stock options and restricted stock units     10 years 10 years
Stock options | 2012 Equity Incentive Plan        
Class of Stock [Line Items]        
Granted (in shares)     708,000 588,500
Restricted stock units | 2012 Equity Incentive Plan        
Class of Stock [Line Items]        
Restricted stock unit grants in period (in shares)     74,100 44,000