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, 2018	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
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			263,156,165			263,156,165		251,477,562
Common stock, shares outstanding			263,156,165			263,156,165		251,477,562
Preferred stock, shares outstanding			0			0		0
Debt issuance amount	$ 230,000
Proceeds from market price stock purchase plan					$ 100	$ 684	$ 106
Market price stock purchase plan					25,000	252,176	25,000
Convertible Promissory Note | Mann Group
Class of Stock [Line Items]
Debt issuance amount				$ 10,000		$ 10,000	$ 9,600
Capitalized interest into common stock				4,000,000		4,000,000	4,000,000
Common stock issued to pay interest			25,950	31,541		57,491
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						$ 19,800	$ 1,900
Number of shares sold during the period						5,059,856	578,063
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock | Weighted Average
Class of Stock [Line Items]
Exchange price per share			$ 3.91		$ 3.26	$ 3.91	$ 3.26