Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2020

Convertible Senior Notes

Schedule of interest expense relating to the Convertible Notes

Interest expense relating to the Convertible Notes in the condensed consolidated statements of operations for the three and six months ended June 30, 2020 are summarized as follows (in thousands):

	June 30,
	2020
Contractual interest expense	$	417
Amortization of debt discount (i)		523
Amortization of debt issuance costs (ii)		34
Total interest expense	$	974

(i) The effective interest rate on the liability component of the 2027 Notes was 9.5% for the three and six months ended June 30, 2020. As of June 30, 2020, the unamortized debt discount was $97.2 million and will be amortized over 6.9 years.

(ii) As of June 30, 2020, the unamortized debt issuance cost for the Convertible Notes was $6.3 million.

Schedule of convertible senior notes

As of June 30, 2020, the convertible senior notes on the condensed consolidated balance sheets represented the carrying amount of the liability component of the Convertible Notes, net of unamortized debt discounts and debt issuance costs, which are summarized as follows (in thousands):

	June 30,
	2020
Convertible Notes	$	287,500
Less: Unamortized debt discount and debt issuance costs		(103,501)
Carrying amount of Convertible Notes	$	183,999