Common stock capital shares value reserved for future issuance.

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Common stock exchange ratio.

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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 additional shares reserved for issuance.

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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 number of vesting installment.

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Share based compensation arrangement by share based payment award options expiration term.

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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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Aggregate number of common shares reserved for future issuance.

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The amount of cash paid for commissions during the current period.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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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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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).

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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 by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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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			3 Months Ended	12 Months Ended
	Jun. 26, 2017 USD ($) $ / shares shares	Jun. 22, 2015 shares	Mar. 31, 2017 USD ($) shares	Dec. 31, 2017 USD ($) Installment $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Nov. 10, 2017 shares	May 26, 2017 USD ($)	Dec. 07, 2016 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred shares authorized				5,000,000
Net proceeds from issuance of common stock, after deducting offering expenses \| $				$ 81,573
Stock option maximum term				4 years 1 month 17 days
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 \| $				$ 12,300	$ 100	$ 6,400
Options outstanding, Aggregate Intrinsic Value \| $				71,658
Options exercisable, Aggregate Intrinsic Value \| $				28,864
Options vested and expected to vest, aggregate intrinsic value \| $				$ 71,700	0	14,000
Restricted stock units awarded				12,600
Total payments for the employees' tax obligations to taxing authorities \| $				$ 654	$ 776	$ 1,546
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				3,601,633
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
Amended and Restated 2013 Stock Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock reserved for issuance under plan							1,000,000
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				835,674
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 Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares subject to repurchase rights				0
Employee Stock Options [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 generally vest as follows: one-third of the award will vest in a series of three successive equal annual installments.
Restricted stock units awarded				12,600	60,000	446,000
Grant date fair value per award of restricted stock units \| $ / shares				$ 15.85	$ 5.16	$ 9.45
Share-based compensation arrangement by share-based payment award, number of vesting installment \| Installment				3
Aggregate fair value of RSUs vested in period \| $				$ 1,200	$ 4,800	$ 4,100
Shares withheld from issuance in order to pay employee taxes				42,243	165,181	172,807
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%
ATM Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issuable and sellable under offering agreement \| $								$ 75,000	$ 75,000
Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares issued	11,500,000			12,371,149
Public offering price of common stock issued \| $ / shares	$ 7.25
Net proceeds from issuance of common stock, after deducting offering expenses \| $	$ 78,100
Common Stock [Member] \| ATM Agreement [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total shares issued			871,149
Net proceeds from issuance of common stock, after deducting offering expenses \| $			$ 3,400
Commission paid to sales agent \| $			$ 100