Income Taxes - Tax Provisions before Discrete Items Reconciled to Recorded Provision for (Benefits from) Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes before discrete items	$ (3,420)	$ 1,096
Interest related to unrecognized tax benefits	112	34
Benefit related to stock based compensation, including ESPP dispositions	(24)	(1,568)
Benefit from reversals of accrued interest related to uncertain tax positions	(150)
Benefit from reassessment of taxes upon filing tax returns		(85)
Benefit from reassessment of taxes upon tax law change	161	(494)
Provision for deemed repatriation transition tax	1,222
Benefit from income taxes	$ (2,135)	$ (1,017)

Income tax reconciliation benefit from reassessment of taxes upon tax law change.

No definition available.

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- Definition

Income tax reconciliation benefit from reversal of accrued interest related to uncertain tax positions.

+ References

No definition available.

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- Definition

Income tax reconciliation nondeductible expense share based compensation cost and employee stock purchase plan dispositions.

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No definition available.

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- Definition

Income tax reconciliation provision for deemed repatriation transition tax.

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No definition available.

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- Definition

Provision For Benefit From Income Taxes Before Discrete Items

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No definition available.

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- References

No definition available.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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- Definition

Amount of interest expense for an underpayment of income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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