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Deferred Revenue and Advance Payments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Deferred Revenue Disclosure [Abstract]    
Deferred product licenses revenue, Current $ 470 $ 1,768
Deferred subscription services revenue, Current 12,812 13,508
Deferred product support revenue, Current 139,402 152,501
Deferred other services revenue, Current 7,560 8,763
Total current deferred revenue and advance payments 160,244 176,540
Deferred product licenses revenue, Non-current 368 542
Deferred subscription services revenue, Non-current 142 2,384
Deferred product support revenue, Non-current 3,440 3,091
Deferred other services revenue, Non-current 537 452
Total non-current deferred revenue and advance payments $ 4,487 $ 6,469