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Stock-Based Compensation - Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 56,150 456,550    
Weighted average grant date fair value for stock options (in dollars per share) $ 13.92 $ 7.47    
Fair value of stock options vested during period $ 1,100 $ 300    
Aggregate intrinsic value of stock options exercised during period $ 3,310 $ 1,000    
Dividend rate 0.00%      
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost not yet recognized on nonvested awards $ 4,500      
Compensation cost not yet recognized, period for recognition 2 years 2 months 12 days      
Dividend rate 0.00% 0.00%    
2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common shares reserved for issuance       4,700,000
Common shares reserved for issuance, annual increase period (not more than) 10 years      
Common shares reserved for issuance, percentage of annual increase 5.00%      
Shares available to be issued 8,495,384      
2009 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available to be issued 0      
2009 and 2015 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unvested shares of common stock outstanding 25,793   29,835  
2009 and 2015 Plan | Accounts Payable, Accrued Expenses and Other Current Liabilities        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Liability from proceeds of early exercise of stock options $ 100   $ 200  
2009 and 2015 Plan | Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 5 years      
Award expiration period 10 years      
2009 and 2015 Plan | Stock options | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Repurchase of unvested shares 0 0