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Equity Incentive Plans - Additional information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 28, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation |  | $ 2,500,000 | $ 3,300,000 | $ 10,600,000 | $ 9,000,000.0 |  |  |
Unrecognized compensation costs |  | $ 16,000,000.0 | $ 18,300,000 | $ 16,000,000.0 | $ 18,300,000 |  |  |
Total unrecognized compensation costs expected to be recognized, Period |  |  |  | 1 year 9 months 18 days | 1 year 10 months 24 days |  |  |
Performance Award shares vested | [1] |  |  | 578,579 | 517,076 |  |  |
Distribution equivalent units |  |  |  | 632,831 | 748,519 |  |  |
Unvested Performance Awards |  | 1,066,693 | 1,149,523 | 1,066,693 | 1,149,523 | 1,037,848 | 989,100 |
Employee Stock option |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  | $ 52,000 | $ 23,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Granted |  |  |  | 143,000 | 123,000 |  |  |
Service vesting awards granted |  |  |  | $ 143,000 | 123,000 |  |  |
Service-Vesting Awards |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Service vesting awards |  |  |  | 2 years |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Granted |  |  |  | $ 11,100,000 | 11,200,000 |  |  |
Service vesting awards granted |  |  |  | $ 11,100,000 | 11,200,000 |  |  |
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. |  |  |  |
Performance Award shares vested |  |  |  | 487,409 |  |  |  |
Distribution equivalent units |  |  |  | 241,770 |  |  |  |
Distribution equivalent units (“DEUs”) were issued with a grant date fair value |  |  |  |  | $ 4,000,000.0 |  |  |
Unvested Performance Awards |  | 0 | 487,409 | 0 | 487,409 |  |  |
Liability Classified Awards |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  | $ 2,300,000 | $ 1,300,000 |  |  |
Unrecognized compensation costs |  | $ 2,300,000 | $ 4,200,000 | $ 2,300,000 | $ 4,200,000 |  |  |
Total unrecognized compensation costs expected to be recognized, Period |  |  |  | 1 year 7 months 6 days | 2 years 2 months 12 days |  |  |
Remaining max award value |  | $ 4,300,000 |  | $ 4,300,000 |  |  |  |
Weighted average performance conditions in liability |  | 100.00% |  | 100.00% |  |  |  |
Accounts payable and accrued liabilities |  | $ 2,000,000.0 | $ 5,300,000 | $ 2,000,000.0 | $ 5,300,000 |  |  |
Liability award vested |  |  |  | $ 6,000,000.0 | $ 0 |  |  |
Two Thousand Eighteen Plan And Director Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  | 18,700,000
Two Thousand Eighteen Plan And Director Plan | Restricted Stock |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  | 300,000
[1] | With respect to certain restricted stock equity awards granted prior to January 1, 2019, receipt of the shares of the Company’s common stock underlying vested restricted stock equity awards will be deferred for four years from grant date unless certain conditions are met. Accordingly, such vested restricted stock equity awards will not be issued as common stock upon vesting until the completion of the deferral period.

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