Convertible Notes (Tables)

12 Months Ended

Dec. 31, 2020

Convertible Notes

Schedule of amortization expense for debt issuance costs

	Amortization
Year	Expense
2021	$	457
2022		457
2023		120
	$	1,034

Convertible Notes

Convertible Notes

Schedule of Convertible Notes

	December 31,
	2020		2019
Par value of the Convertible Notes	$	201,250	$	201,250
Unamortized debt discounts		(27,949)		(36,813)
Unamortized debt issuance costs		(2,772)		(3,673)
Net carrying value of Convertible Notes	$	170,529	$	160,764

Schedule of interest expense related to the Convertible Notes

	Year Ended December 31,
	2020			2019			2018
Contractual interest expense	$	2,012		$	2,012		$	481
Amortization of debt issuance costs		901			849			205
Amortization of debt discount		8,864			8,245			1,992
Total	$	11,777		$	11,106		$	2,678
Effective interest rate of the liability component		7.1	%		7.1	%		7.1	%

Schedule of amortization expense for debt discount and debt issuance costs

	Debt		Debt Issuance
Year	Discounts		Costs
2021	$	9,528	$	955
2022		10,241		1,015
2023		8,180		802
	$	27,949	$	2,772