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Stockholders' Equity - Summary of Stock Option Award Activity (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Weighted-Average Exercise Price
Weighted-Average Exercise Price, Beginning balance	$ 7.83
Weighted-Average Exercise Price, Exercised	2.93
Weighted-Average Exercise Price, Forfeited	13.58
Weighted-Average Exercise Price, Ending balance	$ 8.10	$ 7.83
Weighted-Average Remaining Contractual Term
Weighted-Average Remaining Contractual Term (in years)	5 years 11 months 23 days	6 years 4 months 28 days
Aggregate Intrinsic Value
Aggregate Intrinsic Value, Outstanding	$ 34,567
Aggregate Intrinsic Value, Outstanding	$ 61,054	$ 34,567
Class A Common Stock
Number of Shares
Number of Shares, Beginning balance	13,322
Number of Shares, Exercised	(1,260)
Number of Shares, Forfeited	(969)
Number of Shares, Ending balance	11,093	13,322
Class B Common Stock
Number of Shares
Number of Shares, Beginning balance	2,969
Number of Shares, Exercised	(651)
Number of Shares, Forfeited	(29)
Number of Shares, Ending balance	2,289	2,969

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Aggregate Intrinsic Value [Abstract]

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Remaining Contractual Term [Abstract]

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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