Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Notes Payable

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

	March 31, 2019			December 31, 2018
Principal amount of the Notes	$	325,000		$	325,000
Unamortized debt issuance costs		(5,457	)		(5,813	)
Total convertible notes payable	$	319,543		$	319,187

Interest Expense

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

	Three Months Ended March 31,
	2019		2018
Coupon interest at 3.75%	$	3,047	$	3,047
Amortization of debt issuance costs		356		356
Total interest expense on the Notes	$	3,403	$	3,403