Debt - Schedule of interest expense (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of issuance costs	$ 1,251	$ 773	$ 1,120
Convertible Debt \| Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Contractual interest expense	135
Amortization of issuance costs	$ 711

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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