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Stockholders' Equity - Summary of Stock Options Outstanding (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 8,405,864
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 3 months 4 days
Options Exercisable Number of Shares of common stock subject to options | 5,800,931
Options Exercisable Weighted Average Exercise Price | $ 6.84
Range 1 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 2.55
Upper Range of Exercise Price | $ 3.25
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 212,844
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 7 years 9 months 7 days
Options Exercisable Number of Shares of common stock subject to options | 59,647
Options Exercisable Weighted Average Exercise Price | $ 2.57
Range 2 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 3.45
Upper Range of Exercise Price | $ 3.45
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 1,124,381
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 4 years 11 months 9 days
Options Exercisable Number of Shares of common stock subject to options | 1,124,381
Options Exercisable Weighted Average Exercise Price | $ 3.45
Range 3 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 3.80
Upper Range of Exercise Price | $ 5.26
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 661,565
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 3 years 3 months 29 days
Options Exercisable Number of Shares of common stock subject to options | 596,146
Options Exercisable Weighted Average Exercise Price | $ 4.54
Range 4 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.35
Upper Range of Exercise Price | $ 5.35
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 909,866
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 11 months 1 day
Options Exercisable Number of Shares of common stock subject to options | 909,866
Options Exercisable Weighted Average Exercise Price | $ 5.35
Range 5 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.41
Upper Range of Exercise Price | $ 5.41
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 1,134,524
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 8 years 10 months 21 days
Options Exercisable Number of Shares of common stock subject to options | 270,040
Options Exercisable Weighted Average Exercise Price | $ 5.41
Range 6 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.42
Upper Range of Exercise Price | $ 5.66
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 60,500
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 2 months 27 days
Options Exercisable Number of Shares of common stock subject to options | 60,500
Options Exercisable Weighted Average Exercise Price | $ 5.46
Range 7 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.70
Upper Range of Exercise Price | $ 5.70
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 945,120
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 11 months 5 days
Options Exercisable Number of Shares of common stock subject to options | 676,970
Options Exercisable Weighted Average Exercise Price | $ 5.70
Range 8 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 5.86
Upper Range of Exercise Price | $ 6.82
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 899,022
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 1 month 13 days
Options Exercisable Number of Shares of common stock subject to options | 749,020
Options Exercisable Weighted Average Exercise Price | $ 6.45
Range 9 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 6.92
Upper Range of Exercise Price | $ 11.99
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 365,342
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 5 months 1 day
Options Exercisable Number of Shares of common stock subject to options | 267,361
Options Exercisable Weighted Average Exercise Price | $ 8.68
Range 10 [Member] |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 12.12
Upper Range of Exercise Price | $ 14.62
Options Outstanding and Exercisable Number of Shares of common stock subject to options | 2,092,700
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 9 months 29 days
Options Exercisable Number of Shares of common stock subject to options | 1,087,000
Options Exercisable Weighted Average Exercise Price | $ 14.05

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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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