Common and Preferred Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 01, 2024	Feb. 28, 2021	Feb. 28, 2018	Dec. 31, 2020	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 31, 2023	Oct. 31, 2021
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					270,034,495	263,793,305
Common stock, shares outstanding					270,034,495	263,793,305
Undesignated preferred stock, shares outstanding					0	0
Proceeds from market price stock purchase plan					$ 0.2	$ 0.7	$ 0.1
Market price stock purchase plan					36,004	252,176	25,000
MidCap Credit Facility
Class of Stock [Line Items]
Common stock, shares issued									964,113
Class of Warrant or Right, Number of Securities Called by Warrants or Rights									1,283,467
Convertible Promissory Note | The Mann Group L L C
Class of Stock [Line Items]
Issuance of common stock to note holders				2,800,000	50,844	4,000,000	4,000,000
Conversion of notes accrued interest to common shares, value							$ 0.4
Debt issuance amount				$ 7.0		$ 10.0	$ 9.6
Common stock issued to pay interest					50,844	75,487
2024 Convertible Notes
Class of Stock [Line Items]
Issuance of common stock to note holders		1,666,667
Debt issuance amount		$ 5.0
Tranche 1 | MidCap Credit Facility
Class of Stock [Line Items]
Warrants to purchase of common stock									1,171,614
Tranche 2 | MidCap Credit Facility
Class of Stock [Line Items]
Warrants to purchase of common stock									111,853
Common Stock
Class of Stock [Line Items]
Number of shares sold during the period					1,478,000	5,060,000	578,000
Contolled Equity Offering Sales Agreement | Cantor Fitzgerald | Common Stock | Maximum
Class of Stock [Line Items]
Amount of net proceeds from issuance of securities			$ 50.0
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock
Class of Stock [Line Items]
Amount of net proceeds from issuance of securities					$ 6.9	$ 19.8	$ 1.9
Number of shares sold during the period					1,478,090	5,059,856	578,063
Exchange price per share					$ 4.66
At Market Issuance Sales Agreement | Cantor Fitzgerald | Common Stock | Weighted Average
Class of Stock [Line Items]
Exchange price per share						$ 3.91	$ 3.26
Subsequent Event
Class of Stock [Line Items]
Proceeds from market price stock purchase plan	$ 1.4
Market price stock purchase plan	416,099