General (Details Textual)			3 Months Ended		12 Months Ended
	Feb. 08, 2021	Aug. 21, 2020 USD ($)	Mar. 31, 2021 USD ($) subsidiary $ / shares shares	Mar. 31, 2020 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares	Mar. 15, 2021 $ / shares	May 11, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operations commenced date			Jan. 01, 2005
Subsidiary or equity method investee, number | subsidiary			11
Stock split, conversion ratio	3
Common stock, par value (in dollars per share) | $ / shares			$ 0.001		$ 0.001	$ 0.001
Deferred revenue, revenue recognized			$ 36,750,000
Sales returns			$ 0		$ 0
Capitalized contract cost, amortization period (years)			4 years
Gain (loss) related to the effective portion of the cash flow hedges			$ 2,036,000	$ 57,000
Derivative instruments not designated as hedging instruments, gain (loss), net			$ 771,000	$ 828,000
Restricted Stock Units and Stock Options
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Antidilutive securities excluded from computation of Earnings Per Share, amount (in shares) | shares			8,913,594	9,487,929
Foreign Exchange Contract
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain (loss) related to the effective portion of the cash flow hedges			$ 547,000	$ 57,000
Realized gain on derivative instruments, net of tax			$ 1,489,000
Maintenance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue, performance obligation, description of timing			one year
Revolving Credit Facility | Line of Credit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt instrument, term		3 years
Line of credit facility, maximum borrowing capacity		$ 70,000,000
Line of credit facility, accordion feature, increase limit		90,000,000
Letter of Credit | Line of Credit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Line of credit facility, maximum borrowing capacity		$ 15,000,000
2025 Senior Notes | Convertible Debt Securities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Antidilutive securities excluded from computation of Earnings Per Share, amount (in shares) | shares			8,239,254
2025 Senior Notes | Convertible Debt
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate, stated percentage							1.25%
Principal amount							$ 253,000
Initial conversion price (in dollars per share) | $ / shares			$ 30.71