Income Taxes - Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Carry forward losses and credits	$ 36,092	$ 15,547
Deferred revenues	13,953	13,995
Accrued payroll, commissions, vacation	2,666	1,912
Equity compensation	6,220	5,737
Allowance for doubtful accounts	978	940
Accrued severance pay	340	297
Operating lease liability	12,244	0
Other	532	1,346
Deferred tax assets before valuation allowance	73,025	39,774
Valuation allowance	(62,379)	(39,365)
Deferred tax assets	10,646	409
Deferred tax liability:
Accrued compensation and other accrued expense	(187)	(272)
Operating lease right-of-use asset	(10,291)	0
Deferred tax liability	(10,478)	(272)
Net deferred tax asset	$ 168	$ 137