Debt (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Summary of Equity and Liability Components of the Notes

The following table summarizes information about the net carrying amounts of the Notes as of September 30, 2020:

(in thousands)	2024 Notes		2026 Notes
Principal amount of notes outstanding	$	13,750	$	120,000
Unamortized discount (including unamortized debt issuance cost)	(2,787)		(26,968)
Total long-term portion of notes payable	$	10,963	$	93,032

The following table summarizes interest expense recognized on the Notes for the three and nine months ended September 30, 2020 and 2019:

(in thousands)	Three Months Ended September 30,
	2020		2019
Contractual interest expense	$	1,017	$	900
Amortization of debt issuance costs and discount	1,126		882
Total interest expense	$	2,143	$	1,782

(in thousands)	Nine Months Ended September 30,
	2020		2019
Contractual interest expense	$	3,009	$	1,650
Amortization of debt issuance costs and discount	3,205		1,628
Total interest expense	$	6,214	$	3,278

Schedule of Maturities of Notes

The following table summarizes the future principal payments for the Notes as of September 30, 2020 (in thousands):

2020, remaining	$	—
2021	—
2022	—
2023	—
2024	13,750
Thereafter	120,000
Total	$	133,750