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Stockholders' Equity - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 0 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Series B Convertible Preferred Stock | Dec. 31, 2013 Series B Convertible Preferred Stock | Jun. 30, 2014 Time Based Vesting Schedule | Jun. 30, 2014 Performance Based Vesting Schedule | Jun. 30, 2014 Restricted Stock Units (RSUs) | Jun. 30, 2014 Performance based Vesting Condition | May 31, 2014 2004 Employee Stock Purchase Plan | Jun. 30, 2014 2004 Employee Stock Purchase Plan | Jun. 30, 2014 2004 Employee Stock Purchase Plan Current Period One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |  |
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |
Options vesting period |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 1,676,000 | 3,736,000 | 2,946,000 | 8,002,000 |  |  |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  | 1,900,000 |  | 3,900,000 |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards |  |  |  |  |  |  |  | $ 16,600,000 | $ 400,000 |  |  |  |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  |  |  |  |  | 3 years 11 days |  |  |  |  |  |
Shares reserved and approved for issuance |  |  |  |  |  |  |  |  |  |  |  |  | 996,000 |
Shares issued to employees |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 887,987 | 59,573
Shares remaining available for future purchases |  |  |  |  |  |  |  |  |  |  |  |  | 108,013 |
Warrants to purchase common stock | 10,900,000 |  | 10,900,000 |  |  |  |  |  |  |  |  |  |  |
Warrants exercisable per share | 1.50 |  | 1.50 |  |  |  |  |  |  |  |  |  |  |
Warrants exercised | 100 | 84,000 | 100 | 84,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 5,000,000 |  | 5,000,000 |  | 5,000,000 | 43,000 | 43,000 |  |  |  |  |  |  |
Stock issued during period, shares |  |  |  |  |  | 43,430 |  |  |  |  |  |  |  |
Preferred stock, par value | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |  |  |  |
Convertible common stock shares | 1,000 |  | 1,000 |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, terms of conversion |  |  | The holder is prohibited from converting the Series B Convertible Preferred Stock into shares of common stock if, as a result of such conversion, the holder and its affiliates would own more than 9.98% of the total number of shares of common stock then issued and outstanding. |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, settlement terms |  |  | In the event of the Company’s liquidation, dissolution, or winding up, holders of Series B Convertible Preferred Stock will receive a payment equal to $0.001 per share before any proceeds are distributed to the common stockholders. |  |  |  |  |  |  |  |  |  |  |

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- Definition Specific terms relevant to convertibility. Includes class of preferred stock and number of shares convertible into, exercise (or conversion) price or rates, dates relevant to conversion timing and events relevant to conversion. Describe also any beneficial conversion features. where convertible preferred stock with a nondetachable conversion feature is in-the-money at commitment date. For contingently convertible preferred stock, discuss the circumstances of the contingency, including the events or changes in circumstance that would cause the contingency to be met and any of the significant features necessary to understand the conversion rights and the timing of those rights. Include also an events or changes in circumstance, if any, that could adjust or change the contingency, conversion price, or number of shares, including significant terms of those changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingently Convertible Instruments -URI http://asc.fasb.org/extlink&oid=6508575 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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