FAIR VALUE MEASUREMENT - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Assets:
Investments in loans and securities at fair value	$ 1,040,118		$ 945,269
Liabilities:
Warrant liability	775	$ 561	4,723	$ 2,471	$ 1,992	$ 893
Other liabilities	21,115		13,112
Level 1
Liabilities:
Warrant liability	775		4,723
Other liabilities	0		0
Level 2
Liabilities:
Warrant liability	0		0
Other liabilities	0		0
Level 3
Liabilities:
Warrant liability	0		0
Other liabilities	21,115		13,112
Investments in loans and securities (Notes)
Assets:
Investments in loans and securities at fair value	504,507		408,190
Investments in loans and securities (Notes) \| Level 1
Assets:
Investments in loans and securities at fair value	0		0
Investments in loans and securities (Notes) \| Level 2
Assets:
Investments in loans and securities at fair value	153,400		67,715
Investments in loans and securities (Notes) \| Level 3
Assets:
Investments in loans and securities at fair value	351,107		340,475
Investments in loans and securities (Certificates)
Assets:
Investments in loans and securities at fair value	523,771		532,501
Investments in loans and securities (Certificates) \| Level 1
Assets:
Investments in loans and securities at fair value	0		0
Investments in loans and securities (Certificates) \| Level 2
Assets:
Investments in loans and securities at fair value	0		0
Investments in loans and securities (Certificates) \| Level 3
Assets:
Investments in loans and securities at fair value	523,771		532,501
Investments in loans and securities (Loans)
Assets:
Investments in loans and securities at fair value	11,840		4,578
Investments in loans and securities (Loans) \| Level 1
Assets:
Investments in loans and securities at fair value	0		0
Investments in loans and securities (Loans) \| Level 2
Assets:
Investments in loans and securities at fair value	0		0
Investments in loans and securities (Loans) \| Level 3
Assets:
Investments in loans and securities at fair value	$ 11,840		$ 4,578