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Equity Plans and Stock-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 12 Months Ended | 1 Months Ended
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Dec. 31, 2013 Employee CompensationPlan | Dec. 31, 2012 Employee | Dec. 31, 2011 | Dec. 31, 2013 Employee Stock Purchase Plan | Jan. 31, 2004 Employee Stock Purchase Plan The commencement of the offer period (generally, the fifteenth day in February or August) | Jan. 31, 2004 Employee Stock Purchase Plan The exercise date, which is the last day of a purchase period (generally, the fourteenth day in February or August) | Dec. 31, 2013 Non Employee Awards | Dec. 31, 2013 Additional | Dec. 31, 2012 Additional | Dec. 31, 2013 Restricted Stock Units (RSUs) | Dec. 31, 2012 Restricted Stock Units (RSUs) | Dec. 31, 2011 Restricted Stock Units (RSUs) | Jan. 31, 2004 2004 Plan | Dec. 31, 2013 2004 Plan | Dec. 31, 2013 Inducement Plan | Jan. 31, 2011 2011 Plan | Dec. 31, 2013 2011 Plan | Dec. 31, 2013 Time Based Vesting Schedule | Jan. 31, 2004 Maximum 2004 Plan | Jan. 31, 2004 Maximum 2004 Plan Other Participants | Jan. 31, 2010 Maximum Inducement Plan | May 29, 2013 Maximum 2011 Plan | Jan. 31, 2011 Maximum 2011 Plan | Jan. 31, 2004 Minimum 2004 Plan Stock possessing more than 10% of the voting power of all classes of the Company's stock or the stock of any parent or subsidiary of the Company
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share-based compensation plans | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 |  | 1,500,000 |  | 25,000,000 |
Expiration period | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  | 10 years |  |  |  | 5 years
Purchase price per share as percentage of fair market value of common stock |  |  |  |  | 85.00% | 85.00% |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  | 110.00%
Number of shares of Common Stock outstanding | 15,765,000 | 13,806,000 |  |  |  |  |  |  |  |  |  |  |  | 4,066,277 | 743,625 |  | 10,954,940 |  |  |  |  |  |  |
Increase in the aggregate number of shares of common stock authorized for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |
Shares reserved and approved for issuance |  |  |  | 996,000 |  |  |  |  |  |  |  |  |  |  |  |  | 13,666,964 |  |  |  |  |  |  |
Total intrinsic value of options exercised | $ 300,000 | $ 2,700,000 | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of stock options vested | 12,100,000 | 9,600,000 | 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock based compensation expense related to restricted stock |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value of restricted stock |  |  |  |  |  |  |  |  |  | $ 1.23 | $ 4.23 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of restricted stock units |  |  |  |  |  |  |  |  |  | 100,000 | 200,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |
Options vesting period | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options and restricted stock units outstanding | 2,047,466 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected dividend yield | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized stock-based compensation expense | 4,900,000 | 1,500,000 |  |  |  |  |  | 1,300,000 | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense | 12,340,000 | 10,439,000 | 5,189,000 |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees under stock option | 5 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to non-vested equity awards | $ 3,800,000 |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,300,000 |  |  |  |  |  |
Total unrecognized compensation cost, weighted-average vesting period |  |  |  | 1 year 4 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 9 months 18 days |  |  |  |  |  |
Shares issued to employees |  |  |  | 828,414 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares remaining available for future purchases |  |  |  | 167,586 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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 + 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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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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