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Stock Options - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jun. 07, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized $ 1.1    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 21 months    
Share-based Payment Arrangement, Option And Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted against Share Reserve     1
Number of shares added back, expiration or termination     1
Number of shares added back, withheld, tendered or exchanged     1
Share-based Payment Arrangement, Excluding Than Option And Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted against Share Reserve     2
Number of shares added back, expiration or termination     2
Number of shares added back, withheld, tendered or exchanged     2
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividends 0.00% 0.00%  
2013 Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized     5,858,892