Debt Obligations (Tables)

9 Months Ended

Sep. 30, 2020

Debt Disclosure [Abstract]

Schedule of Net Carrying Amount of Liability Component

The net carrying amount of the liability component of the notes recorded in convertible senior notes, net on the condensed consolidated balance sheets was as follows (in thousands):

	September 30, 2020		December 31, 2019
Principal	$	200,000	$	200,000
Unamortized debt discount	(23,623)		(31,132)
Unamortized debt issuance costs	(2,017)		(2,711)
Net carrying amount of the liability component	$	174,360	$	166,157

Schedule of Interest Expense

The following table sets forth the interest expense related to the notes recognized in interest expense on the condensed consolidated statements of operations (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Contractual interest expense	$	875	$	875	$	2,625	$	2,625
Amortization of debt discount	2,540		2,396		7,510		7,086
Amortization of debt issuance costs	231		230		693		690
Total interest expense related to the Notes	$	3,646	$	3,501	$	10,828	$	10,401