General (Details Textual)		3 Months Ended		12 Months Ended
	Aug. 21, 2020 USD ($)	Mar. 31, 2022 USD ($) subsidiary shares	Mar. 31, 2021 USD ($) shares	Dec. 31, 2021 USD ($)	Jan. 01, 2022 USD ($)	May 11, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operations commenced date		Jan. 01, 2005
Subsidiary or equity method investee, number | subsidiary		12
Deferred revenue, revenue recognized		$ 39,029,000
Sales returns		$ 0		$ 0
Capitalized contract cost, amortization period (years)		4 years
Gain related to the effective portion of the cash flow hedges		$ 420,000	$ 2,036,000
Derivative instruments not designated as hedging instruments, gain, net		741,000	771,000
Income tax expense		1,414,000	$ 559,000
Accumulated deficit		(467,719,000)		(427,603,000)
Additional paid-in capital		$ 1,000,493,000		$ 1,018,005,000
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit					$ 8,647,000
Additional paid-in capital					(30,794,000)
Liabilities					$ 22,147,000
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		9,194,862	8,913,594
Foreign Exchange Contract
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain related to the effective portion of the cash flow hedges		$ 420,000	$ 547,000
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
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