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Incentive Plan - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2018
USD ($)
Employee
shares
Dec. 31, 2017
shares
Dec. 31, 2016
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Unrecognized cost from stock-based awards | $   $ 2.9    
Weighted average recognition period   1 year 7 months 6 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    
Common stock vested   207,690 148,636 16,202
Shares surrendered to satisfy tax obligation   37,670 20,229  
Common stock not vested and were forfeited   12,299    
Restricted Stock Units        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage on number of RSUs granted   100.00% 100.00%  
Awards measurement period 3 years   3 years  
Expected service periods   3 years    
Risk free interest rate minimum   1.00%    
Risk free interest rate maximum   1.97%    
Volatility rate minimum   23.40%    
Volatility rate maximum   42.40%    
REIT index, volatility minimum rate   13.60%    
REIT index, volatility maximum rate   19.20%    
Common stock vested   8,312    
Percentage on number of additional units granted   50.00%    
Number of former employee | Employee   1    
Common stock not vested and were forfeited   194,598 158,927  
Restricted Stock Units | Director        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of former non-employee | Employee   1    
Restricted Stock Units | Employee        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock not vested and were forfeited   194,598 158,927  
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   2,134,091