DEBT - Interest expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest expense
Coupon interest	$ 1,763	$ 1,739	$ 5,232	$ 2,686
Amortization of debt discount	144	186	432	218
Amortization of transaction costs	38	50	114	58
Total interest expense	$ 1,945	$ 1,975	$ 5,778	$ 2,962