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Stockholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 23, 2013 Common Stock [Member] | Sep. 23, 2013 Common Stock [Member] Underwriters [Member] | Dec. 31, 2013 2013 Stock Incentive Plan [Member] | Dec. 31, 2013 2010 Employee Stock Purchase Plan [Member] | Dec. 31, 2013 Stock Option Activity [Member] | Dec. 31, 2013 Stock Option Activity [Member] 2013 Stock Incentive Plan [Member] | Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Installment | Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] | Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares authorized | 5,000,000 |  |  |  |  |  |  |  |  |  |  |
Public offering, common stock shares issued |  |  |  | 7,015,000 |  |  |  |  |  |  |  |
Public offering price of common stock issued |  |  |  | $ 10.58 |  |  |  |  |  |  |  |
Net proceeds from issuance under public offering |  |  |  | $ 69,500,000 |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction |  |  |  |  | 915,000 |  |  |  |  |  |  |
Percent of fair value per share of common stock on option grant date |  |  |  |  |  | 100.00% | 85.00% |  |  |  |  |
Stock option maximum term |  |  |  |  |  | 10 years |  |  |  |  |  |
Specified stockholder ownership percentage | 10.00% |  |  |  |  |  |  |  |  |  |  |
Purchase price of common stock percent under stock incentive plans for specified stockholder | 110.00% |  |  |  |  |  |  |  |  |  |  |
Stock option maximum term for specified stockholder | 5 years |  |  |  |  |  |  |  |  |  |  |
Share based vesting rights | The RSUs will vest as follows: One-third on second anniversary and two-thirds will vest on the third anniversary of the award date. |  |  |  |  |  |  |  | Options granted under the 2013 Plan generally vest over four years at a rate of 25 percent one year from the grant date and one thirty-sixth per month thereafter and expire ten years after the grant, or earlier upon employment termination. | These awards will vest as follows: one-third of the award will vest in a series of three successive equal annual installments. |  |
Stock options vesting period | 2 years |  |  |  |  | 4 years |  |  |  |  |  |
Stock options granted vesting percentage |  |  |  |  |  |  |  |  | 25.00% |  |  |
Stock options expiration term |  |  |  |  |  | 10 years |  |  |  |  |  |
Stock reserved for issuance under plan |  |  |  |  |  | 14,100,000 | 2,100,000 |  |  |  |  |
Annual increase in number of shares authorized |  |  |  |  |  | 9,700,000 |  |  |  |  |  |
Additional shares authorized under 2004 plan | 4,400,000 |  |  |  |  |  |  |  |  |  |  |
Share of common stock subject to a stock option or stock appreciation right | 1 |  |  |  |  |  |  |  |  |  |  |
Fixed ratio shares of common stock | 1.33 shares |  |  |  |  |  |  |  |  |  |  |
Purchase plan offering period |  |  |  |  |  |  | 2 years |  |  |  |  |
Purchase plan purchase period |  |  |  |  |  |  | 6 months |  |  |  |  |
Shares subject to repurchase rights |  |  |  |  |  |  |  | 0 |  |  |  |
Intrinsic value of options exercised | 8,900,000 | 600,000 | 1,000,000 |  |  |  |  |  |  |  |  |
Aggregate intrinsic values outstanding options | 56,425,000 |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic values exercisable options | 41,073,000 |  |  |  |  |  |  |  |  |  |  |
Options vested and expected to vest, aggregate intrinsic value | 54,900,000 | 8,500,000 | 100,000 |  |  |  |  |  |  |  |  |
Restricted stock units issued |  |  |  |  |  |  |  |  |  | 392,500 | 486,750 | 550,000
Grant date fair value of restricted stock units issued |  |  |  |  |  |  |  |  |  | $ 12.12 | $ 5.41 | $ 2.55
Share-based compensation arrangement by share-based payment award, number of vesting installment |  |  |  |  |  |  |  |  |  | 3 |  |
Share-based compensation arrangement by share-based payment award, vesting portion |  |  |  |  |  |  |  |  |  | 0.33 |  |
Share-based compensation arrangement by share-based payment award, vesting portion on second anniversary | 0.33 |  |  |  |  |  |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, vesting portion on third anniversary | 0.67 |  |  |  |  |  |  |  |  |  |  |
Aggregate value of shares vested in period |  |  |  |  |  |  |  |  |  | 4,100,000 | 100,000 | 200,000
Shares withheld from issuance in order to pay employee taxes | 167,138 | 0 | 8,937 |  |  |  |  |  |  |  |  |
Total payments for the employees' tax obligations to taxing authorities | $ 2,000,000 |  | $ 100,000 |  |  |  |  |  |  |  |  |
Shares reserved for issuance of future awards |  |  |  |  |  | 2,929,590 | 1,527,763 |  |  |  |  |

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