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Deferred Revenue and Advance Payments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Deferred Revenue Disclosure [Abstract]    
Deferred product licenses revenue, Current $ 544 $ 1,495
Deferred subscription services revenue, Current 25,916 26,258
Deferred product support revenue, Current 150,963 156,216
Deferred other services revenue, Current 5,395 7,281
Total current deferred revenue and advance payments 182,818 191,250
Deferred product licenses revenue, Non-current 76 139
Deferred subscription services revenue, Non-current 712 8,758
Deferred product support revenue, Non-current 5,920 5,055
Deferred other services revenue, Non-current 554 710
Total non-current deferred revenue and advance payments $ 7,262 $ 14,662