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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
-Section 50
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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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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Stock-Based Compensation - Stock Incentive Plans (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class A common stock
Stock-Based Compensation
Number of common stock available for future grant under stock incentive plans (in shares)	8,100,000
Employee And Non Employee Stock Option [Member]
Stock-Based Compensation
Shares outstanding under stock incentive plans (in shares)	4,951,256	5,968,763	5,893,241	6,669,614
Non-Employee Stock Option [Member] \| Maximum
Stock-Based Compensation
Expiration term	5 years
Employee Stock Options \| Minimum
Stock-Based Compensation
Vesting period	3 years
Employee Stock Options \| Maximum
Stock-Based Compensation
Expiration term	10 years
Vesting period	5 years