Summary of Series B Convertible Preferred Stock and Accretion of Dividend (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stockholders Equity [Line Items]
Dividends earned on Series B preferred stock	$ 1,266	$ 1,206	$ 1,148
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	1,266	1,206
Balance at end of period	$ 26,589	$ 25,323	$ 24,117
Number of shares at beginning of period	6,331	6,029
Cumulative dividends on Series B convertible preferred stock	316	302
Number of shares at end of period	6,647	6,331	6,029