Debt - Interest expense recognized (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Debt
Interest on convertible notes	$ 2,549	$ 2,952	$ 5,099	$ 5,929
Amortization of debt issuance costs	562	622	1,119	1,260
Interest on finance lease		178		363
Interest on borrowings under financing agreement	6,563	4,993	12,556	9,203
Other interest		25		52
Total interest expense	$ 9,674	$ 8,770	$ 18,774	$ 16,807

Amount of the cost of borrowed funds accounted for as interest expense for debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration