Debt conversion converted instrument accrued interest of notes value.

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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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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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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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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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The cash inflow from the additional capital contribution to the entity.

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Date the subsidiary or equity investee issued or sold stock, in CCYY-MM-DD format.

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Per share or per unit amount of equity securities issued.

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Number of new stock issued during the period.

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Common and Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			3 Months Ended
	Mar. 31, 2021	Feb. 28, 2021	Feb. 28, 2018	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Class of Stock [Line Items]
Common stock, shares authorized	400,000,000			400,000,000	400,000,000
Common stock, par value	$ 0.01			$ 0.01	$ 0.01
Undesignated preferred stock, shares authorized	10,000,000			10,000,000	10,000,000
Undesignated preferred stock, par value	$ 0.01			$ 0.01	$ 0.01
Common stock, shares issued	249,072,677			249,072,677	242,117,089
Common stock, shares outstanding	249,072,677			249,072,677	242,117,089
Preferred stock, shares outstanding	0			0	0
Debt issuance amount	$ 230.0
Convertible Promissory Note \| Mann Group
Class of Stock [Line Items]
Conversion of notes accrued interest to common shares, value				$ 0.4
Debt issuance amount				$ 9.6	$ 7.0
Conversion of notes to common shares, shares				4,000,000	2,800,000
2024 Convertible Notes
Class of Stock [Line Items]
Debt issuance amount		$ 5.0
Conversion of notes to common shares, shares		1,666,667
Controlled Equity Offering Sales Agreement \| Cantor Fitzgerald
Class of Stock [Line Items]
Stock sales agreements date			Feb. 28, 2018
Controlled Equity Offering Sales Agreement \| Cantor Fitzgerald \| Common Stock \| Maximum
Class of Stock [Line Items]
Amount of net proceeds from issuance of securities			$ 50.0
At Market Issuance Sales Agreement \| Cantor Fitzgerald \| Common Stock
Class of Stock [Line Items]
Amount of net proceeds from issuance of securities				$ 1.9		$ 0.5
Number of shares sold during the period				578,063		412,870
At Market Issuance Sales Agreement \| Cantor Fitzgerald \| Common Stock \| Weighted Average
Class of Stock [Line Items]
Exchange price per share	$ 3.26			$ 3.26		$ 1.29