General (Details Textual)		3 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2020 USD ($) subsidiary	Mar. 31, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operations commenced date		Jan. 01, 2005
Subsidiary or equity method investee, number | subsidiary		10
Entity incorporation, date of incorporation		Nov. 24, 2004
Deferred revenue, revenue recognized		$ 35,421,000
Sales returns		$ 0	$ 0
Capitalized contract cost, amortization period (years)		4 years
Gain in financial income, net		$ 828,000	471,000
Foreign Exchange Contract
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Derivative, gain (loss) on derivative, net, total		57,000	(451,000)
Ineffective hedges recognized		$ 0	$ 0
Promissory Note
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Line of credit facility, maximum borrowing capacity	$ 7,000,000
Basis spread on variable rate (percentage)	0.05%
Interest rate at period end (percentage)		4.10%
Promissory Note | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate, effective percentage	4.10%
Maintenance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, performance obligation, description of timing		one year