Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2020

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The liability and equity components of the Notes consisted of the following (in thousands):

	June 30, 2020 (unaudited)		December 31, 2019
Liability component:
Principal	$	143,750	$	143,750
Less: Unamortized debt discount	(14,064)		(16,033)
Unamortized debt issuance costs	(2,642)		(3,053)
Net carrying amount	$	127,044	$	124,664
Equity component:
Debt discount for conversion option, net of taxes	$	15,547	$	15,547
Less: Issuance costs, net of taxes	(523)		(523)
Net carrying amount	$	15,024	$	15,024

Interest expense for the three and six months ended June 30, 2020 and 2019 related to the Notes consisted of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Coupon interest	$	853	$	853	$	1,707	$	1,707
Amortization of debt discount	992		937		1,969		1,860
Amortization of debt issuance costs	206		206		412		412
Total interest expense recognized	$	2,051	$	1,996	$	4,088	$	3,979