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Deferred Revenue and Advance Payments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred Revenue Disclosure [Abstract]    
Deferred product licenses revenue, Current $ 1,495 $ 481
Deferred subscription services revenue, Current 26,258 16,561
Deferred product support revenue, Current 156,216 161,670
Deferred other services revenue, Current 7,281 8,395
Total current deferred revenue and advance payments 191,250 187,107
Deferred product licenses revenue, Non-current 139 293
Deferred subscription services revenue, Non-current 8,758 97
Deferred product support revenue, Non-current 5,055 3,417
Deferred other services revenue, Non-current 710 537
Total non-current deferred revenue and advance payments $ 14,662 $ 4,344