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Debt - Convertible notes (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest expense
Coupon interest	$ 262	$ 512	$ 660
Issuance costs amortization	18	31	34
Discount amortization	228	352	536
Interest expense, including amortization of debt issuance costs	$ 508	$ 895	$ 1,230

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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

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