Debt - Exchangeable Senior Notes - Interest expense (Details) - Exchangeable Senior Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Cash coupon	$ 41	$ 60	$ 140	$ 391
Amortization of issuance cost	9	12	29	83
Capitalized interest	(2)		(2)
Total interest expense	$ 48	$ 72	$ 167	$ 474