Equity Compensation Plan, Number Of Plans

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- Definition

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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No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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- 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) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019 shares	Dec. 31, 2020 USD ($) plan $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 shares	Dec. 05, 2019 shares	Jun. 07, 2018 shares	Dec. 07, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity compensation plans \| plan		3
Weighted average grant date fair value (in dollars per share) \| $ / shares		$ 10.82	$ 20.70	$ 38.38
Aggregate intrinsic value of options exercised \| $		$ 600	$ 4,200	$ 32,000
Estimated fair value of common stock (in dollars per share) \| $ / shares		$ 13.51
Employee stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense \| $		$ 41,800
Compensation cost, weighted average recognition period		2 years 1 month 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
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost, weighted average recognition period		2 years 4 months 24 days
Unrecognized compensation expense \| $		$ 16,100
Fair value of restricted stock vested \| $		$ 11,500	$ 9,800	$ 5,100
Shares issued (in shares)		424,613
Vested (in shares)		267,872
Non-vested shares cancelled and replaced (in shares)	43,071	101,629
Stock-based compensation, non vesting (in shares)		809,527	754,415
Weighted average fair value (in dollars per share) \| $ / shares		$ 14.37
Restricted stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards, vesting period		1 year
Restricted stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based awards, vesting period		4 years
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)		98,817
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 \| $		$ 2,300
Compensation cost, weighted average recognition period		2 years 8 months 12 days
Shares issued (in shares)		85,305
Vested (in shares)		12,567
Non-vested shares cancelled and replaced (in shares)		7,367
Stock-based compensation, non vesting (in shares)	43,071	107,182	41,811
Weighted average fair value (in dollars per share) \| $ / shares		$ 12.76