Estimated Fair Value Of Common Stock

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Lump Sum Percentage

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

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

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- Definition

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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- Definition

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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- Definition

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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- Definition

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

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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No definition available.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Stock-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 05, 2019	Jun. 07, 2018	Dec. 07, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)		$ 20.70	$ 38.38	$ 35.01
Aggregate intrinsic value of options exercised		$ 4,200	$ 32,000	$ 8,600
Estimated fair value of common stock (in dollars per share)		$ 24.17
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 72,300
Compensation cost, weighted average recognition period		2 years 7 months 6 days
Second Amendment and Restated Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards (in shares)		10,229,068				4,500,000
Inducement Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards (in shares)				874,500	100,000		418,000
Minimum \| Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards, vesting period		1 year
Maximum \| Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards, vesting period		4 years
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost, weighted average recognition period		2 years 8 months 12 days
Unrecognized compensation expense		$ 22,800
Fair value of restricted stock vested		$ 9,800	$ 5,100	$ 1,300
Shares issued (in shares)		519,167
Vested (in shares)		214,276
Non-vested shares cancelled and replaced (in shares)		123,182
Stock-based compensation, non vesting (in shares)		754,415	572,706
Weighted average fair value (in dollars per share)		$ 40.07
Restricted Stock With Non-Market Performance Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)				98,817
Vested (in shares)		69,171
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (in shares)		645,814
Lump sum percentage (equal to)		85.00%
Fair value equivalent of common stock		$ 25
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 1,900
Compensation cost, weighted average recognition period		2 years 8 months 12 days
Non-vested shares cancelled and replaced (in shares)	43,071
Stock-based compensation, non vesting (in shares)	43,071	41,811
Weighted average fair value (in dollars per share)		$ 19.22