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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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