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Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (2,012)
Reclassification of stranded tax effects from tax reform			(26)
Foreign currency translation	$ (3,394)	$ 2,514	(1,691)	$ 3,304
Unrealized gain (loss) on investments, net of tax	62	7	(53)	24
Ending Balance	(3,782)		(3,782)
Beginning Balance			141,189
Ending Balance	140,111		140,111
Net Unrealized Loss on Marketable Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(256)	(66)	(115)	(83)
Reclassification of stranded tax effects from tax reform			(26)
Unrealized gain (loss) on investments, net of tax	62	7	(53)	24
Ending Balance	(194)	(59)	(194)	(59)
Cumulative Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(194)	(6,700)	(1,897)	(7,490)
Foreign currency translation	(3,394)	2,514	(1,691)	3,304
Ending Balance	(3,588)	(4,186)	(3,588)	(4,186)
Total Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(450)	(6,766)	(2,012)	(7,573)
Ending Balance	$ (3,782)	$ (4,245)	$ (3,782)	$ (4,245)

X

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Tax cuts and jobs act of 2017, reclassification from AOCI to retained earnings, tax effect.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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