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Deferred Revenue and Advance Payments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Deferred Revenue Disclosure [Abstract]    
Deferred product licenses revenue, Current $ 633 $ 1,768
Deferred subscription services revenue, Current 15,393 13,508
Deferred product support revenue, Current 152,866 152,501
Deferred other services revenue, Current 7,894 8,763
Total current deferred revenue and advance payments 176,786 176,540
Deferred product licenses revenue, Non-current 405 542
Deferred subscription services revenue, Non-current 116 2,384
Deferred product support revenue, Non-current 3,083 3,091
Deferred other services revenue, Non-current 571 452
Total non-current deferred revenue and advance payments $ 4,175 $ 6,469