Summary of Series B Convertible Preferred Stock and Accretion of Dividend (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Stockholders Equity [Line Items]
Dividends earned on Series B preferred stock	$ 313	$ 298
Series B Convertible Preferred Stock
Stockholders Equity [Line Items]
Balance at beginning of period	25,323	24,117
Dividends earned on Series B preferred stock	313	298
Balance at end of period	$ 25,636	$ 24,415
Number of shares at beginning of period	6,331	6,029
Cumulative dividends on Series B convertible preferred stock	78	75
Number of shares at end of period	6,409	6,104