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FAIR VALUE MEASUREMENTS - Schedule of Carrying Value and Fair Value of the Company Debt Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total $ 768,947 $ 705,447
Reported Value Measurement | Secured Debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 768,947 705,447
Reported Value Measurement | Secured Debt | Wells Fargo Financing Facility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 140,800 111,300
Reported Value Measurement | Secured Debt | Subscription Facility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 17,500 0
Reported Value Measurement | Secured Debt | SMBC Financing Facility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 268,647 252,147
Reported Value Measurement | Secured Debt | Class A-1 Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 199,000 199,000
Reported Value Measurement | Secured Debt | Class A-1F Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 34,250 34,250
Reported Value Measurement | Secured Debt | Class A-L Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 30,000 30,000
Reported Value Measurement | Secured Debt | Class B Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 47,250 47,250
Reported Value Measurement | Secured Debt | Class C Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Total 31,500 31,500
Estimate of Fair Value Measurement | Secured Debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 756,928 692,152
Estimate of Fair Value Measurement | Secured Debt | Wells Fargo Financing Facility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 140,800 111,300
Estimate of Fair Value Measurement | Secured Debt | Subscription Facility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 17,500 0
Estimate of Fair Value Measurement | Secured Debt | SMBC Financing Facility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 268,647 252,147
Estimate of Fair Value Measurement | Secured Debt | Class A-1 Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 193,926 193,627
Estimate of Fair Value Measurement | Secured Debt | Class A-1F Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 32,243 31,705
Estimate of Fair Value Measurement | Secured Debt | Class A-L Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 29,235 29,190
Estimate of Fair Value Measurement | Secured Debt | Class B Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value 44,935 44,888
Estimate of Fair Value Measurement | Secured Debt | Class C Notes    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Long-term debt, fair value $ 29,642 $ 29,295