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Common Stock - Summary of Stock Options Outstanding Regarding Number of Common Shares Issuable upon Exercise of Outstanding Options (Detail) | 12 Months Ended
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Dec. 31, 2016 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Number of Outstanding Options | shares | 1,115,647
Exercise Price Range, Weighted Average Exercise Price | $ 7.99
Exercise Price Range, Weighted Average Remaining Contractual Life | 9 years 4 months 13 days
Range one [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 2.89
Exercise Price Range, Upper Range Limit | $ 6.95
Exercise Price Range, Number of Outstanding Options | shares | 1,052,200
Exercise Price Range, Weighted Average Exercise Price | $ 2.89
Exercise Price Range, Weighted Average Remaining Contractual Life | 9 years 6 months 29 days
Range two [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 6.96
Exercise Price Range, Upper Range Limit | $ 15.73
Exercise Price Range, Number of Outstanding Options | shares | 4,090
Exercise Price Range, Weighted Average Exercise Price | $ 11.00
Exercise Price Range, Weighted Average Remaining Contractual Life | 8 years 4 months 24 days
Range three [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 15.74
Exercise Price Range, Upper Range Limit | $ 20.63
Exercise Price Range, Number of Outstanding Options | shares | 17,983
Exercise Price Range, Weighted Average Exercise Price | $ 20.46
Exercise Price Range, Weighted Average Remaining Contractual Life | 7 years 4 months 17 days
Range four [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 20.64
Exercise Price Range, Upper Range Limit | $ 37.35
Exercise Price Range, Number of Outstanding Options | shares | 6,452
Exercise Price Range, Weighted Average Exercise Price | $ 31.53
Exercise Price Range, Weighted Average Remaining Contractual Life | 6 years 9 months 3 days
Range five [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 37.36
Exercise Price Range, Upper Range Limit | $ 128.64
Exercise Price Range, Number of Outstanding Options | shares | 2,451
Exercise Price Range, Weighted Average Exercise Price | $ 84.08
Exercise Price Range, Weighted Average Remaining Contractual Life | 5 years 9 months
Range six [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 128.65
Exercise Price Range, Upper Range Limit | $ 130.57
Exercise Price Range, Number of Outstanding Options | shares | 8,905
Exercise Price Range, Weighted Average Exercise Price | $ 129.69
Exercise Price Range, Weighted Average Remaining Contractual Life | 6 years 2 months 12 days
Range seven [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 130.58
Exercise Price Range, Upper Range Limit | $ 134.81
Exercise Price Range, Number of Outstanding Options | shares | 6,450
Exercise Price Range, Weighted Average Exercise Price | $ 131.45
Exercise Price Range, Weighted Average Remaining Contractual Life | 5 years 2 months 8 days
Range eight [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 134.82
Exercise Price Range, Upper Range Limit | $ 143.88
Exercise Price Range, Number of Outstanding Options | shares | 5,927
Exercise Price Range, Weighted Average Exercise Price | $ 142.41
Exercise Price Range, Weighted Average Remaining Contractual Life | 4 years 4 months 9 days
Range nine [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 143.89
Exercise Price Range, Upper Range Limit | $ 185.85
Exercise Price Range, Number of Outstanding Options | shares | 7,019
Exercise Price Range, Weighted Average Exercise Price | $ 172.70
Exercise Price Range, Weighted Average Remaining Contractual Life | 3 years 4 days
Range ten [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Exercise Price Range, Lower Range Limit | $ 185.86
Exercise Price Range, Upper Range Limit | $ 245.08
Exercise Price Range, Number of Outstanding Options | shares | 4,170
Exercise Price Range, Weighted Average Exercise Price | $ 237.60
Exercise Price Range, Weighted Average Remaining Contractual Life | 2 years 2 months 16 days

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock 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=96867065&loc=d3e5070-113901 + Details
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