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Common and Preferred Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Feb. 28, 2018
Jun. 30, 2023
Jun. 30, 2022
May 31, 2023
Dec. 31, 2022
Class of Stock [Line Items]          
Common stock, shares authorized   800,000,000   400,000,000 400,000,000
Common stock, par value   $ 0.01     $ 0.01
Undesignated preferred stock, shares authorized   10,000,000     10,000,000
Undesignated preferred stock, par value   $ 0.01     $ 0.01
Common stock, shares issued   268,235,145     263,793,305
Common stock, shares outstanding   268,235,145     263,793,305
Preferred stock, shares outstanding   0     0
Proceeds from market price stock purchase plan   $ 1,075 $ 684    
Market Price Stock Purchase Plan ("MPSPP")          
Class of Stock [Line Items]          
Proceeds from market price stock purchase plan   $ 200 $ 700    
Market price stock purchase plan   36,004 252,176    
Convertible Promissory Note | The Mann Group L L C          
Class of Stock [Line Items]          
Debt issuance amount     $ 10,000    
Capitalized interest into common stock     4,000,000    
Common stock issued to pay interest   23,683 31,541    
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   $ 2,800      
Number of shares sold during the period   631,383 0    
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock | Weighted Average          
Class of Stock [Line Items]          
Exchange price per share   $ 4.4