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Incentive Plan - Additional Information (Details)
$ in Millions
6 Months Ended
Aug. 08, 2018
shares
Dec. 31, 2015
Jun. 30, 2018
USD ($)
Employee
shares
Jun. 30, 2017
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unrecognized cost from stock-based awards | $     $ 4.4  
Weighted average recognition period     1 year 10 months 24 days  
Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards vesting description     The awards generally cliff vest over three years or vest ratably over three years from the date of grant.  
Awards vesting period     3 years  
Shares surrendered to satisfy tax obligation     5,249  
Common stock vested     29,032 11,110
Restricted Stock | Subsequent Event        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares surrendered to satisfy tax obligation 22,743      
Restricted Stock | Subsequent Event | Certain Employee        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock vested 124,932      
Restricted Stock Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage on number of RSUs granted     100.00%  
Awards measurement period   3 years 3 years  
Expected service periods     3 years  
Percentage on number of additional units granted     50.00%  
Number of former employee | Employee     1  
Common stock vested     8,312  
Common stock not vested and were forfeited     7,200  
Restricted Stock Units | Subsequent Event | Employee        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock not vested and were forfeited 187,398      
Restricted Stock Units | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage on number of RSUs granted   0.00% 0.00%  
Restricted Stock Units | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage on number of RSUs granted   100.00% 150.00%  
2014 Equity Incentive Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares authorized     3,356,723  
Shares available for future issuance     1,934,394