Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plans - Additional information (Details)

v3.23.3
Equity Incentive Plans - Additional information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Jun. 28, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation $ 3,300,000 $ 2,500,000 $ 9,800,000 $ 10,600,000      
Unrecognized compensation costs $ 21,300,000 $ 16,000,000 $ 21,300,000 $ 16,000,000      
Total unrecognized compensation costs expected to be recognized, period     2 years 9 months 18 days 1 year 9 months 18 days      
Performance award shares vested (in shares)     526,292 578,579      
Unvested performance awards (in shares) 1,735,389 1,066,693 1,735,389 1,066,693 958,985 1,037,848  
Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Service vesting percentages     0.00%        
Maximum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Service vesting percentages     200.00%        
Employee Stock Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation     $ 73,000 $ 52,000      
Service vesting awards granted     $ 134,000 143,000      
Service-Vesting Awards              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Service vesting awards     2 years        
Service vesting awards granted     $ 18,300,000 $ 11,100,000      
Service-Vesting Awards | Share-Based Payment Arrangement, Tranche One              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Service vesting percentages     33.33%        
Service-Vesting Awards | Share-Based Payment Arrangement, Tranche Two              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Service vesting percentages     33.33%        
Service-Vesting Awards | Share-Based Payment Arrangement, Tranche Three              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Service vesting percentages     33.33%        
Performance Vesting Awards              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Service vesting awards     The total compensation will be determined by the Company’s TSR relative to specified BDCs during a specified performance period. Depending on the results achieved during the specified performance period, the actual number of shares that a grant recipient receives at the end of the period may range from 0% to 200% of the target shares granted.        
Vesting period     4 years        
Performance award shares vested (in shares)     0        
Unvested performance awards (in shares) 0 0 0 0      
Performance Vesting Awards | Minimum              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Disposal period after vesting     1 year        
Performance Vesting Award              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Performance award shares vested (in shares)       487,409      
Performance DEUs              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Performance award shares vested (in shares)     54,858 241,770      
Distribution equivalent units (“DEUs”) were issued with a grant date fair value     $ 700,000 $ 4,000,000      
Liability Classified Awards              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation     1,100,000 2,300,000      
Unrecognized compensation costs $ 900,000 $ 2,300,000 $ 900,000 $ 2,300,000      
Total unrecognized compensation costs expected to be recognized, period     7 months 6 days 1 year 7 months 6 days      
Vesting period     4 years        
Remaining max award value $ 3,100,000   $ 3,100,000        
Weighted average performance conditions in liability 100.00%   100.00%        
Accounts payable and accrued liabilities $ 2,200,000 $ 2,000,000 $ 2,200,000 $ 2,000,000      
Liability award vested     $ 0 $ 6,000,000      
Other Liability Classified Awards              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period     3 years        
2018 Plan | Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock, shares authorized (in shares)             9,261,229
Director Plan | Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock, shares authorized (in shares)             300,000
2018 and Direct Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock, shares authorized (in shares)             18,700,000
2018 and Direct Plan | Restricted Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock, shares authorized (in shares)             300,000