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Share-Based Compensation - Summary of Information about Restricted Stock Grants Outstanding (Details) - USD ($)
shares in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Unearned Compensation $ 1,400,000 $ 1,600,000    
Restricted Stock        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 1,575 75    
Nonvested Shares (in shares) 1,590 746 403 760
Restricted Stock | October 2017        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 303      
Nonvested Shares (in shares) 51      
Unearned Compensation $ 40,300      
Remaining Period to Vesting 1 month      
Restricted Stock | October 2018        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 382      
Nonvested Shares (in shares) 130      
Unearned Compensation $ 473,100      
Remaining Period to Vesting 13 months      
Restricted Stock | October 2019        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 12      
Nonvested Shares (in shares) 10      
Unearned Compensation $ 51,500      
Remaining Period to Vesting 25 months      
Restricted Stock | January 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 149      
Nonvested Shares (in shares) 134      
Unearned Compensation $ 527,700      
Remaining Period to Vesting 25 months      
Restricted Stock | April 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 646      
Nonvested Shares (in shares) 520      
Unearned Compensation $ 947,700      
Remaining Period to Vesting 27 months      
Restricted Stock | June 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 210      
Nonvested Shares (in shares) 210      
Unearned Compensation $ 432,800      
Remaining Period to Vesting 14 months      
Restricted Stock | June 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 380      
Nonvested Shares (in shares) 350      
Unearned Compensation $ 772,900      
Remaining Period to Vesting 20 months      
Restricted Stock | June 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Shares Granted (in shares) 185      
Nonvested Shares (in shares) 185      
Unearned Compensation $ 310,600      
Remaining Period to Vesting 8 months      
Vesting period 1 | Restricted Stock | October 2017        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 1 | Restricted Stock | October 2018        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 1 | Restricted Stock | October 2019        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 1 | Restricted Stock | January 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 1 | Restricted Stock | April 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 2 | Restricted Stock | October 2017        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 2 | Restricted Stock | October 2018        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 2 | Restricted Stock | October 2019        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 2 | Restricted Stock | January 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 2 | Restricted Stock | April 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 3 | Restricted Stock | October 2017        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 3 | Restricted Stock | October 2018        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 3 | Restricted Stock | October 2019        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 3 | Restricted Stock | January 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%      
Vesting period 3 | Restricted Stock | April 2020        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Restricted stock vesting installment (as a percent) 33.33%