Equity Transactions - Rights Offering - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Feb. 28, 2021
Class Of Stock [Line Items]
Common stock, par value	$ 0.001		$ 0.001
Aggregate issue costs		$ 37
Common Stock [Member]
Class Of Stock [Line Items]
Issuance of stock, shares	344,205	257,185
Aggregate issue costs		$ 130
Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Number of shares issuable upon conversion				73,000