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Stock-Based Compensation - Additional Information (Details)
3 Months Ended 9 Months Ended 12 Months Ended 22 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
Jun. 05, 2017
shares
Mar. 22, 2017
shares
Mar. 16, 2017
USD ($)
shares
Jul. 19, 2016
installment
shares
Dec. 31, 2014
Dec. 01, 2013
installment
shares
Sep. 30, 2013
$ / shares
shares
Jun. 14, 2013
shares
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Mar. 31, 2017
shares
Mar. 04, 2013
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Granted (in shares)                       793,738   1,274,549      
Outstanding value of options (in dollars per share) | $ / shares                       $ 14.00   $ 2.25      
Forfeited (in shares)                       5,148   114,456      
Deferred IPO bonus expense | $                   $ 677,000   $ 7,706,000          
Canceled (in shares)                       (571,927)   0      
Common stock, par value (in dollars per share) | $ / shares $ 0.001             $ 0.001   $ 0.001   $ 0.001   $ 0.001      
Stock-based compensation | $                   $ 751,000 $ 510,000 $ 8,730,000 $ 1,130,000        
Restricted Stock Units (RSUs)                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Granted (in shares)     372,335         372,335       691,585          
Canceled (in shares)     (372,335)                            
Restricted stock units, conversion of stock, conversion rights (in shares)               1                  
Granted (in dollars per share) | $ / shares               $ 3.89       $ 13.65          
Vested (in shares)                       0          
Performance stock units                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Granted (in shares)                       169,635          
Vested (in shares)                       0          
Stock Option Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Number of shares authorized (in shares)                                 4,645,884
Deferred IPO bonus expense | $       $ 5,100,000                          
Stock Option Plan | Stock options                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Granted (in shares)                             3,499,228    
Outstanding value of options (in dollars per share) | $ / shares                             $ 3.96    
Expiration period           10 years                      
Incentive Award Plan                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Number of shares authorized (in shares)                               5,800,000  
Compensation cost not yet recognized, period for recognition 2 years 10 months 24 days                                
Tax benefit from compensation expense | $                       $ 8,700,000 1,100,000        
Compensation not yet recognized, stock options | $ $ 7,500,000                 $ 7,500,000   7,500,000          
Incentive Award Plan | Restricted Stock Units (RSUs)                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Number of shares authorized (in shares)   319,250                              
Granted (in shares)   319,250                              
Stock-based compensation | $                       5,800,000 0        
Restricted stock units, conversion of stock, conversion rights (in shares)   1                              
Incentive Award Plan | Performance stock units                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Stock-based compensation | $                       200,000 0        
June 14, 2013 | Stock Option Plan | Stock options                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Granted (in shares)                 2,799,408                
Expiration period                 10 years                
Award vesting rights                 25.00%                
Stock-based compensation | $                       700,000 900,000        
December 1, 2013 | Stock Option Plan | Stock options                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Granted (in shares)             699,820                    
Number of installments | installment             4                    
Expiration period             10 years                    
Forfeited (in shares)                           114,456      
July 19, 2016 | Stock Option Plan | Stock options                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Granted (in shares)         1,274,549                        
Number of installments | installment         5                        
Expiration period         10 years                        
Stock-based compensation | $                       1,800,000 200,000        
March 16, 2017 | Stock Option Plan | Stock options                                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Granted (in shares)       793,738                          
Expiration period       10 years                          
Stock-based compensation | $                       $ 400,000 $ 0