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Net proceeds from issuance public offering.

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Purchase plan offering period.

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Purchase plan purchase period.

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Share based compensation arrangement by share based payment award number of shares initially reserved for issuance.

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Share based compensation arrangement by share based payment award options maximum term for specified stock holder.

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Share based compensation arrangement by share based payment award purchase price of common stock percent for specified stockholder.

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Specified stockholder ownership percentage.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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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.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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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).

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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).

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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.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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Percentage of vesting of share-based compensation awards.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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.

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Weighted average grant-date fair value of options vested.

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Purchase price of common stock expressed as a percentage of its fair value.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Number of shares of common stock subject to repurchase or cancellation determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period. Common stock subject to repurchase are outstanding common shares that are contingently returnable (that is, subject to recall).

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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands				12 Months Ended
	Jun. 22, 2015 shares	Mar. 25, 2014 USD ($) $ / shares shares	Sep. 23, 2013 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) Installment $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred shares authorized				5,000,000
Proceeds from public offering of common stock, net of issuance costs \| $					$ 93,796	$ 69,492
Stock option maximum term				4 years 11 months 1 day
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 of common stock subject to a stock option or stock appreciation right				100.00%
Fixed ratio shares of common stock				1.33
Intrinsic value of options exercised \| $				$ 6,400	20,400	8,900
Options outstanding, Aggregate Intrinsic Value \| $				14,074
Options exercisable, Aggregate Intrinsic Value \| $				13,119
Options vested and expected to vest, aggregate intrinsic value \| $				$ 14,000	$ 49,400	$ 54,900
Aggregate estimated fair value of stock options vested \| $ / shares				$ 1.4	$ 0.5	$ 0.5
Restricted stock units awarded				446,000
Aggregate value of shares vested in period \| $				$ 3,500	$ 9,100	$ 4,100
Total payments for the employees' tax obligations to taxing authorities \| $				$ 1,546	$ 4,556	$ 2,015
Share-Based Compensation Awards, Tranche 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted vesting percentage				0.33%
Share-Based Compensation Awards, Tranche 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted vesting percentage				0.33%
2013 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of fair value per share of common stock on option grant date				100.00%
Stock options vesting period				4 years
Stock options expiration term				10 years
Stock reserved for issuance under plan				14,100,000
Additional shares authorized under 2013 stock incentive plan	5,300,000			4,400,000
Shares reserved for issuance of future awards				4,508,405
2004 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock reserved for issuance under plan				9,700,000
2010 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of fair value per share of common stock on option grant date				85.00%
Stock reserved for issuance under plan				2,100,000
Purchase plan offering period				2 years
Purchase plan purchase period				6 months
Shares reserved for issuance of future awards				1,292,379
Maximum [Member] \| 2013 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option maximum term				10 years
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares subject to repurchase rights				0
Employee Stock Option [Member] \| 2013 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting rights				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.
Stock options granted vesting percentage				25.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based vesting rights				These awards will vest as follows: one-third of the award will vest in a series of three successive equal annual installments.
Restricted stock units awarded				446,000	488,000	392,500
Grant date fair value of restricted stock units awarded \| $ / shares				$ 9.45	$ 14.05	$ 12.12
Share-based compensation arrangement by share-based payment award, number of vesting installment \| Installment				3
Shares withheld from issuance in order to pay employee taxes				172,807	309,102	167,138
Restricted Stock Units (RSUs) [Member] \| Share-Based Compensation Awards, Tranche 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted vesting percentage				0.33%
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Public offering, common stock shares issued		4,444,444	7,015,000		4,444,444	7,015,000
Public offering price of common stock issued \| $ / shares		$ 22.50	$ 10.58
Proceeds from public offering of common stock, net of issuance costs \| $		$ 93,800	$ 69,500
Underwriters \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, number of shares issued in transaction			915,000