v3.19.3

Convertible Notes - Debt issuance costs and interest expense (Details) - Convertible Notes $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Interest expense related to the Convertible Notes
Contractual interest expense	$ 503	$ 1,509
Amortization of debt issuance costs	213	632
Amortization of debt discount	2,079	6,127
Total	$ 2,795	$ 8,268
Effective interest rate of the liability component	7.10%	7.10%
Amortization and interest expense capitalized	$ 740	$ 1,948

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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