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Stock-Based Compensation (Additional Information) (Details)
3 Months Ended 12 Months Ended 63 Months Ended
Dec. 31, 2018
shares
Mar. 31, 2018
USD ($)
offering_periods
shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
Jun. 30, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from sale of exercise of stock options, net   $ 473,000 $ 765,000    
Deferred Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense (income)     0    
Stock vested (shares) | shares   0      
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, contractual term (years)   10 years      
Stock options, grants in period, gross | shares         0
Options exercised, total intrinsic value   $ 1,500,000      
Proceeds from sale of exercise of stock options, net   $ 500,000      
Performance-Based Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock award program, measurement period (years)   3 years      
Expected dividend yield (percent)   0.00%      
Compensation expense (income)   $ 1,000,000 100,000    
Stock vested (shares) | shares   81,230      
Performance-Based Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)   0.00%      
Performance-Based Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)   200.00%      
Time Based Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense (income)   $ 1,500,000 1,000,000    
Stock vested (shares) | shares   76,996      
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense (income)   $ 100,000 $ 100,000    
Employee stock purchase plan, number of offering (offering period) | offering_periods   2      
Employee stock purchase plan, offering period (months)   6 months      
Employee stock purchase plan, purchase price discount (percent)       15.00%  
Forecast | Time Based Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock vested (shares) | shares 2,200