Period Of Historical Data Used To Calculate Expected Volatility In Year

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Sale of Stock, Offering Amount

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Share based compensation arrangement by share based payment award fair value assumptions risk free interest rate.

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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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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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- Definition

Cash received on stock transaction after deduction of issuance costs.

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No definition available.

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- Definition

Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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- Definition

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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No definition available.

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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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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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

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

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

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Value, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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Capital Stock - Capital Stock (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
	Apr. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock, share authorized (in shares)		25,000,000		25,000,000
Preferred stock, par value (in usd per share)		$ 1		$ 1
Common stock, share authorized (in shares)		725,000,000		725,000,000
Common stock, par value (in usd per share)		$ 0.001		$ 0.001
Preferred stock, share issued (in shares)		0
Stock options granted (in shares)		2,646,903	1,048,916
Stock option per share value (in usd per share)		$ 3.98	$ 8.67
Restricted stock units
Class of Stock [Line Items]
Number of shares or units granted equity based compensation awards (in shares)		796,733	625,878
Fair value of granted stock		$ 3.3	$ 5.4
Vesting period		3 years
Restricted stock awards
Class of Stock [Line Items]
Number of shares or units granted equity based compensation awards (in shares)		144,441	79,869
Fair value of granted stock		$ 0.5	$ 0.7
Stock option
Class of Stock [Line Items]
Period Of Historical Data Used To Calculate Expected Volatility In Year		5 years
Stock option, term		10 years
Vesting period		3 years
Weighted-average grant-date fair value of options granted (in usd per share)		$ 1.47
Expected volatility used in computing fair value of options granted		65.20%
Expected life used in computing fair value of options granted, years		5 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate		5.90%
Risk-free interest rate used in computing fair value of options granted		2.50%
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Estimated Forfeiture Rate		6.00%
Parent Company [Member] \| Common Stock
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)		10,000,000
Sale of Stock, Price Per Share		$ 9.75
Net proceeds from equity issuances of subsidiaries		$ 93.0
Continuous Offering Program [Member]
Class of Stock [Line Items]
Sale of Stock, Offering Amount	$ 63.0
Continuous Offering Program [Member] \| Parent Company [Member]
Class of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)		1,100,000
Sale of stock, consideration received per transaction		$ 10.7