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Shareholders' Equity and Share Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 20, 2021 USD ($) $ / shares shares | Sep. 10, 2020 $ / shares shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Aug. 16, 2021 shares | Dec. 31, 2020 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |  |  |  |
Common Stock, Shares, Issued |  |  | 86,241,701 |  | 86,241,701 |  | 4,707,113 | 66,911,811
Commencing date |  |  |  |  | May 26, 2021 |  |  |
Terminating date |  |  |  |  | May 25, 2022 |  |  |
Purchase of common shares |  |  | 4,062,309 |  | 4,062,309 |  |  |
Common shares purchase percentage |  |  |  |  | 0.05 |  |  |
Stock repurchased during period, shares |  |  |  |  | 536,052 |  |  |
Stock repurchased cost | $ |  |  | $ 1,020 |  | $ 5,000 |  |  |
Shares issued in pubic offering, net of issuance costs (in shares) | 10,887,097 | 9,396,226 |  |  |  |  |  |
Purchase price | $ / shares | $ 12.40 |  |  |  |  |  |  |
Proceeds from issuance of common stock before placement agent fees and offering expense | $ | $ 135,000 |  |  |  |  |  |  |
Description of units sold |  | Each unit that was sold consisted of one common share of the Company and one-half (0.5) of a warrant to purchase a common share of the Company |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights | $ / shares |  | $ 5.80 |  |  |  |  |  |
Warrants exercisable beginning date |  | Mar. 10, 2021 |  |  |  |  |  |
Warrants exercisable expiration date |  | Sep. 10, 2025 |  |  |  |  |  |
Number of warrants exercised |  |  | 3,188,680 |  | 3,188,680 |  |  |
Share based compensation expense | $ |  |  | $ 1,820 | $ 472 | $ 5,705 | $ 1,329 |  |

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