Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

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

	March 31, 2020 (unaudited)		December 31, 2019
Liability component:
Principal	$	143,750	$	143,750
Less: Unamortized debt discount	(15,055)		(16,033)
Unamortized debt issuance costs	(2,848)		(3,053)
Net carrying amount	$	125,847	$	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 months ended March 31, 2020 and 2019 related to the Notes consisted of the following (in thousands):

	Three Months Ended March 31,
	2020		2019
Coupon interest	$	854	$	854
Amortization of debt discount	977		923
Amortization of debt issuance costs	206		206
Total interest expense recognized	$	2,037	$	1,983