Common stock capital shares reserved for future issuance annual automatic increase in shares.

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- Definition

Common stock capital shares reserved for future issuance annual automatic increase percentage.

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options grants in period grant date fair value granted value.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award remaining vesting period.

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No definition available.

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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
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-Paragraph 1
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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Paragraph 14
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- Definition

Weighted average expected volatility rate of share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

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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.

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-Paragraph 2
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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- Definition

Percentage of vesting of share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)
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- Definition

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

+ References

No definition available.

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Equity Incentive Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Proceed from stock option exercises		$ 21,868	$ 1,333	$ 2,670
Stock-based Compensation		$ 16,070	$ 10,459	$ 7,815
Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining vesting period		3 years
Stock options, exercisable period		10 years
Weighted-average grant date fair value of option granted		$ 5.94	$ 5.73	$ 6.05
Fair value of shares vested		$ 11,600	$ 8,300	$ 7,600
Total intrinsic value of options exercised		38,500	2,900	5,400
Proceed from stock option exercises		$ 21,900	$ 1,300	$ 2,700
Stock option, weighted average volatility rate		34.70%	38.90%	42.70%
Unrecognized compensation cost		$ 14,900
Weighted-average remaining expected term		2 years 3 months 18 days
Stock Option \| One year from the date of requisite service
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage granted		25.00%
RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Remaining vesting period		3 years
Weighted-average remaining expected term		3 years 3 months 18 days
Aggregate grant date fair value of RSUs granted		$ 27,800	$ 10,400
Stock-based Compensation		5,300
Unrecognized compensation cost		$ 28,800
RSU \| One year from the date of requisite service
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage granted		25.00%
2016 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future issuance			4,237,746
Automatically increase percentage of shares of all classes of company's common stock outstanding			5.00%
2016 Equity Incentive Plan \| Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Automatically increase of shares reserved for issuance	2,105,647
2016 Equity Incentive Plan \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Automatically increase of shares reserved for issuance			5,500,000
2007 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future issuance		0
2011 Executive Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future issuance		0
2016 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Automatically increase percentage of shares of all classes of company's common stock outstanding		1.00%
2016 Employee Stock Purchase Plan \| Common Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares issued			311,742
2016 Employee Stock Purchase Plan \| Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future issuance		821,635
Automatically increase of shares reserved for issuance		1,600,000
Purchase price of common stock, percent		85.00%
2016 Employee Stock Purchase Plan \| Subsequent Event \| Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Automatically increase of shares reserved for issuance	421,129