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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jun. 01, 2014
shares
Feb. 28, 2018
installment
$ / shares
shares
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense | $     $ 904 $ 536
Unamortized stock-based compensation expense related to unvested awards | $     $ 6,900  
Weighted average remaining vesting period related to expense recognition     2 years 6 months  
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 Award | 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)     7,600  
Unvested stock awards outstanding (in shares)     7,380  
Restricted Stock Award | Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)   141,060    
Award grant date fair value (in usd per share) | $ / shares   $ 15.13    
Number of equal annual vesting installments | installment   4    
Performance Stock Award | Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of awards granted (in shares)   120,460    
Award grant date fair value (in usd per share) | $ / shares   $ 15.13