Common and Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	May 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Common stock, shares authorized		800,000,000		800,000,000		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		269,543,539		269,543,539			263,793,305
Common stock, shares outstanding		269,543,539		269,543,539			263,793,305
Preferred stock, shares outstanding		0		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				37,122	57,491
Common Stock
Class of Stock [Line Items]
Number of shares sold during the period		847,000	5,060,000
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				$ 6,900	$ 19,800
Number of shares sold during the period				1,478,090	5,059,856
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock | Weighted Average
Class of Stock [Line Items]
Exchange price per share		$ 4.66	$ 3.91	$ 4.66	$ 3.91