Long-term Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

Interest expense for the three and nine months ended September 30, 2018 related to the Notes consisted of the following (in thousands):

	Three and Nine Months Ended September 30, 2018
Coupon interest	$	190
Amortization of debt discount	200
Amortization of debt issuance costs	45
Total interest expense recognized	$	435

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

	As of September 30, 2018
Liability component:
Principal	$	143,750
Less: Unamortized debt discount	(20,716		)
Unamortized debt issuance costs	(3,996		)
Net carrying amount	$	119,038
Equity component:
Debt discount for conversion option, net of taxes	$	15,547
Less: Issuance costs, net of taxes	(511		)
Net carrying amount	$	15,036