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Stock-Based Compensation - Summary of Stock Option Activity and Related Information (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Options Outstanding
Beginning balance (shares) | shares	10,313,138
Granted (shares) | shares	1,956,205
Exercised (shares) | shares	(513,790)
Forfeited (shares) | shares	(260,831)
Ending balance (shares) | shares	11,494,722
Vested and expected to vest (shares) | shares	11,126,906
Exercisable (shares) | shares	8,117,842
Weighted-Average Exercise Price per Share
Beginning balance (USD per share) | $ / shares	$ 11.22
Granted (USD per share) | $ / shares	14.17
Exercised (USD per share) | $ / shares	9.80
Forfeited (USD per share) | $ / shares	16.07
Ending balance (USD per share) | $ / shares	11.67
Vested and expected to vest (USD per share) | $ / shares	11.59
Exercisable (USD per share) | $ / shares	$ 10.68
Weighted- Average Remaining Contractual Life
Balance (in years)	6 years 3 months
Vested and expected to vest (in years)	6 years 2 months 1 day
Exercisable (in years)	5 years 2 months 12 days
Aggregate Intrinsic Value
Balance | $	$ 56,610
Vested and expected to vest | $	55,668
Exercisable | $	$ 47,725

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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 into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. 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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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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