Equity Transactions - Rights Offering - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Feb. 28, 2021
Class Of Stock [Line Items]
Issuance of Common Stock, conversion of Preferred Stock to Common Stock	$ 2		$ 3
Common stock, par value	$ 0.001		$ 0.001		$ 0.001
Aggregate issue costs			$ 0	$ 411
Common Stock [Member]
Class Of Stock [Line Items]
Issuance of Common Stock, conversion of Preferred Stock to Common Stock	$ 4		$ 6
Issuance of stock, shares	3,226,859	70,000	3,964,478	327,185
Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares issuable upon conversion						73,000