Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 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):

	June 30, 2020		December 31, 2019
Liability component:
Principal	$	345,000	$	345,000
Unamortized discount	(53,327)		(57,247)
Unamortized issuance costs	(6,662)		(7,152)
Net carrying amount	$	285,011	$	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 June 30, 2020		Six Months Ended June 30, 2020
Contractual interest expense	$	970	$	1,940
Amortization of debt discount	1,967		3,920
Amortization of issuance costs	246		490
Total interest expense	$	3,183	$	6,350