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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

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