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Equity Incentive Plans - Summary of Activity Related to Outstanding Stock Options (Details) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Service Period Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding Beginning Balance		1,793,981
Shares, Granted		23,536
Shares, Exercised		(417,962)
Shares, Forfeited		(1,191)
Shares, Outstanding Ending Balance	1,398,364	1,398,364
Weighted Average Exercise Price, Outstanding Beginning Balance		$ 9.84
Weighted Average Exercise Price, Granted		42.29
Weighted Average Exercise Price, Exercised		8.40
Weighted Average Exercise Price, Forfeited		9.64
Weighted Average Exercise Price, Outstanding Ending Balance	$ 10.82	$ 10.82
Performance-Vested Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding Beginning Balance		1,275,746
Shares, Granted	295,936	9,254
Shares, Exercised		(35,447)
Shares, Forfeited		(39,253)
Shares, Outstanding Ending Balance	1,210,300	1,210,300
Weighted Average Exercise Price, Outstanding Beginning Balance		$ 13.62
Weighted Average Exercise Price, Granted		42.29
Weighted Average Exercise Price, Exercised		9.98
Weighted Average Exercise Price, Forfeited		9.05
Weighted Average Exercise Price, Outstanding Ending Balance	$ 14.09	$ 14.09
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, Outstanding Beginning Balance		271,979
Shares, Granted		77,609
Shares, Issued upon vesting		(122,392)
Shares, Forfeited		(2,528)
Shares, Outstanding Ending Balance	224,668	224,668
Weighted-Average Grant-Date Fair Value Per Unit, Outstanding Beginning Balance		$ 19.07
Weighted-Average Grant-Date Fair Value Per Unit, Granted		41.82
Weighted-Average Grant-Date Fair Value Per Unit, Issued Upon Vesting		17.57
Weighted-Average Grant-Date Fair Value Per Unit, Forfeited		27.42
Weighted-Average Grant-Date Fair Value Per Unit, Outstanding Ending Balance	$ 27.65	$ 27.65

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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.

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

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

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