Convertible Senior Notes (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Summary of Convertible Debt

The net carrying amount of the liability and equity components of the Notes was as follows (in thousands):

	March 31, 2020		December 31, 2019
Liability component:
Principal	$	345,000	$	345,000
Unamortized discount	(55,294)		(57,247)
Unamortized issuance costs	(6,908)		(7,152)
Net carrying amount	$	282,798	$	280,601
Equity component, net of purchase discounts and issuance costs	$	58,560	$	58,560

Interest expense related to the Notes is as follows (in thousands):

	Three Months Ended March 31, 2020
Contractual interest expense	$	970
Amortization of debt discount	1,953
Amortization of issuance costs	244
Total interest expense	$	3,167