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Treasury Stock - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 13 Months Ended
Sep. 09, 2020
Aug. 07, 2018
Sep. 09, 2019
Aug. 31, 2017
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2020
Share Repurchase Program September 9, 2019              
Equity Class Of Treasury Stock [Line Items]              
Stock repurchase, shares             162,000
Common stock repurchase, value         $ 1.6 $ 1.6 $ 1.6
Common Stock | Share Repurchase Program August 2017              
Equity Class Of Treasury Stock [Line Items]              
Stock approved for repurchase, value       $ 7.0      
Period of stock repurchase program       12 months      
Additional period of stock repurchase program   12 months          
Common Stock | Share Repurchase Program September 9, 2019              
Equity Class Of Treasury Stock [Line Items]              
Stock approved for repurchase, value     $ 7.0        
Period of stock repurchase program     12 months        
Additional period of stock repurchase program 12 months            
Common Stock | Share Repurchase Program August 2017 and September 2019              
Equity Class Of Treasury Stock [Line Items]              
Stock repurchase, shares         0 69,000  
Stock repurchase, average price per share           $ 8.78  
Stock repurchase, cost           $ 0.6