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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 01, 2014
shares
Jul. 31, 2017
$ / shares
shares
Feb. 28, 2017
installment
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense associated with grants | $       $ 700 $ 300 $ 1,792 $ 1,207
Unamortized stock-based compensation expense related to unvested awards | $       4,500   $ 4,500  
Weighted average remaining vesting period related to expense recognition           2 years  
Ensign Employees              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted stock award conversion ratio related to the spin-off 1            
Restricted Stock Awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense associated with grants | $       $ 700 $ 300 $ 1,800 $ 1,200
Restricted Stock Awards | Ensign Employees              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock awards unvested during spin-off (in shares) 207,580            
Shares vested (in shares)       5,960      
Unvested stock awards outstanding (in shares)       20,360   20,360  
Restricted Stock Awards | Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equal annual vesting installments | installment     3        
Restricted Stock Awards | Board of Directors              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of restricted stock awards granted (in shares)   20,766 233,768        
Restricted stock award grant date fair value (in usd per share) | $ / shares   $ 18.30 $ 15.21