Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2019

Long-Term Debt

Schedule of notes payable

Total convertible notes payable consisted of the following at (in thousands):

	June 30,		December 31,
	2019		2018
Principal amount of the Notes	$	325,000	$	325,000
Unamortized debt issuance costs		(5,101)		(5,813)
Total convertible notes payable	$	319,899	$	319,187

Schedule of interest expense

Interest expense incurred in connection with the Notes consisted of the following (in thousands):

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Coupon interest at 3.75%	$	3,047	$	3,047	$	6,094	$	6,094
Amortization of debt issuance costs		356		356		712		712
Total interest expense on the Notes	$	3,403	$	3,403	$	6,806	$	6,806