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General - Audited Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 7,141 | $ 8,061 | $ 5,416 | $ 3,254 | $ (6,778) | $ 2,176 | $ 1,968 | $ 2,985 | $ 23,872 | $ 351 | $ 4,963
Reconciliation of net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  | 2,798 | 9,616 | (2,083)
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred costs |  |  |  |  |  |  |  |  | (5,564) | (7,813) | (4,085)
Accrued compensation |  |  |  |  |  |  |  |  | 3,957 | 1,304 | 2,291
Deferred revenue |  |  |  |  |  |  |  |  | 7,094 | 5,588 | 2,852
Net cash provided by operating activities |  |  |  |  |  |  |  |  | $ 55,015 | 31,050 | 18,765
ASU 2014-09 [Member] | As Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | (2,440) | 5,710
Reconciliation of net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  | 10,854 | (1,698)
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred costs |  |  |  |  |  |  |  |  |  | (6,548) | (4,964)
Accrued compensation |  |  |  |  |  |  |  |  |  | 2,073 | 2,180
Deferred revenue |  |  |  |  |  |  |  |  |  | 5,107 | 2,710
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 31,050 | 18,765
ASU 2014-09 [Member] | Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  |  | 2,791 | (747)
Reconciliation of net income to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  |  |  |  |  |  |  | (1,238) | (385)
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Deferred costs |  |  |  |  |  |  |  |  |  | (1,265) | 879
Accrued compensation |  |  |  |  |  |  |  |  |  | (769) | 111
Deferred revenue |  |  |  |  |  |  |  |  |  | $ 481 | $ 142

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