Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Carry forward losses and credits	$ 53,221	$ 36,092
Deferred revenues	13,054	13,953
Accrued payroll, commissions, vacation	3,808	2,666
Equity compensation	10,348	6,220
Allowance for doubtful accounts	1,287	978
Accrued severance pay	312	340
Operating lease liability	11,302	12,244
Other	963	532
Deferred tax assets before valuation allowance	94,295	73,025
Valuation allowance	(77,542)	(62,379)
Deferred tax assets	16,753	10,646
Deferred tax liability:
Accrued compensation and other accrued expense	(48)	(187)
Operating lease right-of-use asset	(8,780)	(10,291)
Convertible senior notes, net	(6,797)	0
Deferred tax liability	(15,625)	(10,478)
Net deferred tax asset	$ 1,128	$ 168