v3.19.1

Convertible Notes - Debt issuance costs and interest expense (Details) - Convertible Notes $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Interest expense related to the Convertible Notes
Contractual interest expense	$ 503
Amortization of debt issuance costs	208
Amortization of debt discount	2,006
Total	$ 2,717
Effective interest rate of the liability component	7.10%
Amortization and interest expense capitalized	$ 465

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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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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.

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