Debt (Tables)

12 Months Ended

Dec. 31, 2019

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):

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

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

	Year ended December 31, 2019
Contractual interest expense	$	1,444
Amortization of debt discount	2,900
Amortization of issuance costs	362
Total interest expense	$	4,706