Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

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

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

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

	June 30, 2019
Liability component:
Principal	$	143,750
Less: Unamortized debt discount	(17,946		)
Unamortized debt issuance costs	(3,466		)
Net carrying amount	$	122,338
Equity component:
Debt discount for conversion option, net of taxes	$	15,547
Less: Issuance costs, net of taxes	(523		)
Net carrying amount	$	15,024