Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Tax credits carryforwards	$ 10,100
Tax expense from intercompany transfer	9,245	$ 2,306	$ 898
Deferred taxes from intercompany transfer	4,243	0	(873)
Deferred tax assets, deferred revenue	13,891	16,488
Deferred tax liabilities, capitalizing commission and fringe benefits	15,003	13,273
Unrecognized tax benefits	7,163	4,814	$ 1,199	$ 736
Effective tax rate impact	100	100
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	186,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	132,000
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	163,600
Accounting Standards Update 2016-02
Operating Loss Carryforwards [Line Items]
Deferred tax asset, operating lease liability		1,700
Deferred tax liability, operating lease right-of-use asset		1,700
IPO
Operating Loss Carryforwards [Line Items]
Valuation allowance		$ 1,900
ISRAEL
Operating Loss Carryforwards [Line Items]
Tax expense from intercompany transfer	6,300
Deferred taxes from intercompany transfer	$ 4,200