Summary of Series B Convertible Preferred Stock and Accretion of Dividend (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stockholders Equity [Line Items]
Dividends earned on Series B preferred stock	$ 1,206	$ 1,148	$ 1,094
Series B Convertible Preferred Stock
Stockholders Equity [Line Items]
Balance at beginning of period	24,117	22,969
Dividends earned on Series B preferred stock	1,206	1,148
Balance at end of period	$ 25,323	$ 24,117	$ 22,969
Number of shares at beginning of period	6,029	5,742
Cumulative dividends on Series B convertible preferred stock	302	287
Number of shares at end of period	6,331	6,029	5,742