v3.20.4

Convertible Notes - Debt issuance costs and interest expense (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Convertible Notes
Debt issuance costs incurred			$ 1,815	$ 695
Convertible Notes
Convertible Notes
Debt issuance costs incurred	$ 6,169
Additional paid-in capital	1,442
Amortization of remaining financing costs	$ 4,727
Interest expense related to the Convertible Notes
Contractual interest expense		$ 2,012	2,012	481
Amortization of debt issuance costs		901	849	205
Amortization of debt discount		8,864	8,245	1,992
Total		$ 11,777	$ 11,106	$ 2,678
Effective interest rate of the liability component		7.10%	7.10%	7.10%
Amortization and interest expense capitalized		$ 4,062	$ 3,042	$ 508

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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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