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Stock Award Plans - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Jun. 02, 2011 | Mar. 03, 2011 | Mar. 17, 2012 | May 21, 2009 | Mar. 31, 2004 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Options Held | Dec. 31, 2012 Restricted Stock Unit | Dec. 31, 2012 Performance Based Stock Options | Dec. 31, 2012 Milestones Not Considered Probable Of Achievement | Mar. 31, 2004 Employee Stock Purchase Plans | Dec. 31, 2012 Employee Stock Purchase Plans | May 17, 2012 Performance Based Share Awards | May 17, 2012 Time Based Awards | Aug. 01, 2010 Stock Option And Award Plans | Jul. 09, 2008 Stock Option And Award Plans | Dec. 31, 2012 Consultant | Dec. 31, 2012 Minimum | Mar. 31, 2004 Maximum | Dec. 31, 2012 Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option grants vest exercisable rate |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock vesting rate |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance mile stone period range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 months |  | 96 months
Options vesting period |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted expiry term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years
Options granted |  |  |  |  |  | 9,795,600 |  |  |  |  |  |  |  |  | 3,942,500 | 3,892,500 |  |  |  |  |  |
Weighted average grant date fair value of the stock options granted |  |  |  |  |  | $ 0.99 | $ 2.04 | $ 4.06 |  |  |  |  |  |  | $ 0.60 | $ 1.12 |  |  |  |  |  |
Options vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Options vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 01, 2014 |  |  |  |  |  |
Stock based compensation expense related to stock award plans and the ESPP |  | $ 8,200,000 |  |  |  | $ 13,292,000 | $ 11,204,000 | $ 13,580,000 |  |  |  |  |  |  |  | $ 6,700,000 |  |  |  |  |  |
Restricted stock units granted |  | 1,177,300 |  |  |  | 1,371,455 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted |  | 1,467,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock units vesting period |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock available for issuance | 6,000,000 |  | 10,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding option to purchase common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,417,840 |  |  |  |
Option purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,493,509 |  |  |  |
Restricted stock unit issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,246,781 |  |  |  |
Unamortized stock compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,900,000 |  |  |  |
Incremental stock compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 |  |  |  |  |
Shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 2,674,003 |  |  |  |  |  |  |  |
Share reserve automatic increase each year |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |
Share reserve |  |  |  |  |  | 700,000 | 700,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share of common stock outstanding |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved under ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Shares sold to employees |  |  |  |  |  | 422,260 | 282,816 | 287,597 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options to purchase common stock |  |  |  |  |  | 18,674,539 | 10,082,351 |  |  |  |  |  |  |  |  |  |  |  | 243,033 |  |  |
Total intrinsic value of options exercised |  |  |  |  |  | 1,000 | 443,000 | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash received from the exercise of options |  |  |  |  |  | 9,200 | 625,000 | 924,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average remaining contractual term |  |  |  |  |  | 6 years 6 months | 8 years | 8 years 1 month 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units expected to vest |  |  |  |  |  | 3,254,819 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value |  |  |  |  |  | $ 3.74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of restricted stock units expected to vest |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of restricted stock units vested |  |  |  |  |  | 2,900,000 | 1,700,000 | 10,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of restricted stock units vested |  |  |  |  |  | 3,000,000 | 1,600,000 | 11,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to non vested stock options |  |  |  |  |  |  |  |  | $ 12,200,000 | $ 7,800,000 | $ 107,000 | $ 3,700,000 |  |  |  |  |  |  |  |  |  |
Weighted average vesting period for unrecognized compensation cost |  |  |  |  |  | 2 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Net number of share options (or share units) granted during the 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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