Estimate expectation weighting percentage.

No definition available.

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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=96867065&loc=d3e5070-113901

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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

+ Details

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- Definition

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

+ References

+ Details

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

+ Details

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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- Definition

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.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901

+ Details

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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.

+ Details

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

+ Details

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- Definition

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

+ References

No definition available.

+ 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

+ Details

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- Definition

Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended			12 Months Ended
	Jan. 29, 2014	Sep. 30, 2013	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance			134,877,000			134,877,000
Expected dividend yield						0.00%	0.00%	0.00%
2013 Employee stock purchase plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance			2,720,000			2,720,000
Available for future grants			2,719,701			2,719,701
Expected dividend yield						0.00%	0.00%	0.00%
Unrecognized share-based compensation expense, remaining weighted-average vesting periods						4 months 24 days
Eligible compensation under the Employee Stock Purchase Plan			15.00%			15.00%
Purchase of maximum shares by employees under Employee Stock Purchase Plan						3,000
Purchase price of Employee Stock Purchase Plan as a percentage of fair value						90.00%
Unrecognized share-based compensation expense			$ 1.1	$ 0.7		$ 1.1	$ 0.7
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized share-based compensation expense			3.8	11.0		$ 3.8	$ 11.0
Unrecognized share-based compensation expense, remaining weighted-average vesting periods						1 year 4 months 24 days	2 years
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period contractual term						4 years
Unrecognized share-based compensation expense, remaining weighted-average vesting periods						2 years 8 months 12 days	2 years 9 months 18 days
Unrecognized share-based compensation expense			$ 79.1	$ 46.9		$ 79.1	$ 46.9
Company's Historical Data
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimate expected weighting percentage			100.00%	75.00%	25.00%
Simplified Method Estimate
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimate expected weighting percentage			0.00%	25.00%	75.00%
Historical Volatilities of Peer Group
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimate expected weighting percentage					75.00%
Company's Historical Volatility
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimate expected weighting percentage			100.00%	75.00%
Company’s Peer Group Volatilities
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimate expected weighting percentage			0.00%	25.00%
Class A common stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares outstanding			65,855,000	61,292,000		65,855,000	61,292,000
Class A common stock \| 2013 Employee stock purchase plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares outstanding			1,250,000			1,250,000
Percentage of outstanding shares of common stock						1.00%
Common stock shares, additional						743,818
Purchase price of Employee Stock Purchase Plan as a percentage of fair value						90.00%
2013 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of outstanding shares of common stock						5.00%
Available for future grants			10,390,944			10,390,944
Graded vesting schedule, number of years continuous service						4 years
Vesting period contractual term	7 years
2013 Equity Incentive Plan \| Previously Reported
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period contractual term		10 years
2013 Equity Incentive Plan \| Class A common stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance			6,200,000			6,200,000
Common stock, shares outstanding			6,200,000			6,200,000
Common stock shares, additional						3,719,091