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Common and Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Feb. 28, 2021 | Feb. 28, 2018 | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Oct. 01, 2021 | Nov. 30, 2020 | Aug. 31, 2019
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 |  |  |  | 250,245,831 |  | 242,117,089 |  | 250,245,831 |  |  |  |
Common stock, shares outstanding |  |  |  | 250,245,831 |  | 242,117,089 |  | 250,245,831 |  |  |  |
Preferred stock, shares outstanding |  |  |  | 0 |  | 0 |  | 0 |  |  |  |
Debt issuance amount | $ 230,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from market price stock purchase |  |  |  | $ 0 |  |  | $ 0 | $ 106 | $ 14 |  |  |
Market price stock purchase plan |  |  |  |  |  |  |  | 25,000 |  |  |  |
MidCap Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  |  |  | 111,853 | 1,171,614
MidCap Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  |  |  |  |  | 964,113 |  |
Shares issued |  |  |  |  |  |  |  |  |  | 1,283,467 |  |
Convertible Promissory Note | Mann Group |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes accrued interest to common shares, value |  |  |  |  | $ 400 |  |  |  |  |  |  |
Debt issuance amount |  |  |  |  | $ 9,600 | $ 7,000 |  | $ 9,600 |  |  |  |
Conversion of notes to common shares, shares |  |  |  |  | 4,000,000 | 2,800,000 |  | 4,000,000 |  |  |  |
2024 Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance amount |  | $ 5,000 |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 50,000 |  |  |  |  |  |  |  |  |
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of net proceeds from issuance of securities |  |  |  |  |  |  |  | $ 1,900 | $ 15,600 |  |  |
Number of shares sold during the period |  |  |  |  |  |  |  | 578,063 | 9,401,827 |  |  |
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange price per share |  |  |  | $ 3.26 |  |  | $ 1.66 | $ 3.26 | $ 1.66 |  |  |

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