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Summary of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 USD ($) shares
Options Outstanding |  |
Restricted stock units outstanding at December 31, 2016 | 353,838 |
Granted | 125,067 |
Exercised | (63,811) |
Forfeited/cancelled | (10,313) |
Restricted stock units outstanding at March 31, 2017 | 404,781 |
Vested and expected to vest at March 31, 2017 | 378,579 | [1]
Weighted-Average Remaining Contractual Term (in years) |  |
Restricted stock units outstanding at March 31, 2017 | 3 years 1 month 13 days |
Vested and expected to vest at March 31, 2017 | 3 years 4 days | [1]
Aggregate Intrinsic Value |  |
Restricted stock units outstanding at March 31, 2017 | $ | $ 14,248 |
Vested and expected to vest at March 31, 2017 | $ | $ 13,326 | [1]
[1] | Represents the number of vested restricted stock units as of March 31, 2017 plus the number of unvested restricted stock units expected to vest as of March 31, 2017 based on the unvested outstanding restricted stock units at March 31, 2017 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

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- Definition Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Vested and Expected to Vest Outstanding Weighted Average Remaining Contractual Term + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + Details
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