FAIR VALUE MEASUREMENT - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Assets:
Investments in loans and securities	$ 911,425		$ 716,793
Liabilities:
Warrant liability	1,671	$ 1,342	3,242	$ 3,835	$ 1,210	$ 1,400
Notes
Assets:
Investments in loans and securities	248,686		90,425
Certificates and Other loans and receivables
Assets:
Investments in loans and securities	662,739		626,368
Level 1
Liabilities:
Warrant liability	1,086		2,106
Level 1 | Notes
Assets:
Investments in loans and securities	0		0
Level 1 | Certificates and Other loans and receivables
Assets:
Investments in loans and securities	0		0
Level 2
Liabilities:
Warrant liability	585		1,136
Level 2 | Notes
Assets:
Investments in loans and securities	58,007		90,425
Level 2 | Certificates and Other loans and receivables
Assets:
Investments in loans and securities	0		0
Level 3
Liabilities:
Warrant liability	0		0
Level 3 | Notes
Assets:
Investments in loans and securities	190,679		0
Level 3 | Certificates and Other loans and receivables
Assets:
Investments in loans and securities	$ 662,739		$ 626,368