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Stock-Based Compensation - Narrative (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Equity Incentive Plan 2008 | Jun. 30, 2013 Equity Incentive Plan 2008 | Jan. 31, 2013 Equity Incentive Plan 2008 Stock Option | Jun. 30, 2013 Equity Incentive Plan 2008 Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Maximum number of shares to be issued for cancellation or repurchase of options under the 1998 plan |  |  |  |  |  | 3,084,848 |  |
Shares issued for cancellation or repurchase of options under the 1998 plan |  |  |  |  |  | 365,696 |  |
Annual increase provision, allowable percentage |  |  |  |  |  | 5.00% |  |
Annual increase provision, maximum allowable shares |  |  |  |  |  | 1,785,714 |  |
Increase in authorized shares |  |  |  |  |  |  | 1,294,874 |
Stock options, number of shares reserved for issuance |  |  |  |  | 5,835,258 | 5,835,258 |  |
Stock options, maximum term | 5 years 6 months | 5 years 6 months | 5 years 6 months | 5 years 8 months 15 days |  |  |  | 10 years
Stock options, average vesting period |  |  |  |  | 4 years |  |  |
Unvested options outstanding | 1,768,033 |  | 1,768,033 |  |  |  |  |
Unvested options outstanding, vesting period |  |  | 2 years 4 months 24 days |  |  |  |  |
Unrecognized compensation expense | $ 8.0 |  | $ 8.0 |  |  |  |  |

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- Definition 2008 Plan annual increase allowable is equal to the lesser of 5% of the outstanding shares of our common stock on the last day of the immediately preceding fiscal year or 1,785,714 shares. + References No definition available. + Details
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- Definition Maximum number of shares that can be issued to the 2008 Plan for cancellation or repurchase of options under the 1998 plan. + References No definition available. + Details
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- Definition Total number of shares issued to the 2008 Plan for cancellation or repurchase of options under the 1998 plan. + References No definition available. + 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 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 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)(a, b) -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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