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Stockholders' Equity (ESPP) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Risk-free interest rate     1.61% 1.44%    
Forecast            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Risk-free interest rate 1.83% 1.72%        
ESPP            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense     $ 53 $ 48 $ 150 $ 144
Dividend yield         0.01%  
Expected volatility         20.89%  
Expected holding period (years)     6 months 3 months    
ESPP | Forecast            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected holding period (years) 1 year 9 months