Quarterly Financial Information (Unaudited) - Condensed Consolidated Statement of Changes in Equity (Unaudited) (Detail) - USD ($) $ in Thousands	3 Months Ended							6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Beginning balance	$ 84,002	$ 84,695	$ 85,859	$ 86,352	$ 88,515	$ 88,091	$ 87,590	$ 85,859	$ 87,590	$ 85,859	$ 87,590	$ 85,859	$ 87,590
Net income (loss)	(713)	(1,843)	(1,268)	(1,047)	(2,500)	(9)	(39)	(3,111)	(48)	(3,824)	(2,548)	(5,595)	(3,595)
Ending balance	83,345	84,002	84,695	85,859	86,352	88,515	88,091	84,002	88,515	83,345	86,352	86,780	85,859
Common Stock
Beginning balance	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2
Beginning balance (in shares)	21,154,425	20,825,792	20,806,186	20,806,186	20,806,186	20,775,160	20,461,337	20,806,186	20,461,337	20,806,186	20,461,337	20,806,186	20,461,337
Ending balance	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 3	$ 2
Ending balance (in shares)	21,154,425	21,154,425	20,825,792	20,806,186	20,806,186	20,806,186	20,775,160	21,154,425	20,806,186	21,154,425	20,806,186	23,148,374	20,806,186
Accumulated Deficit
Beginning balance	$ (82,587)	$ (80,699)	$ (79,393)	$ (78,214)	$ (75,680)	$ (75,606)	$ (75,502)	$ (79,393)	$ (75,502)	$ (79,393)	$ (75,502)	$ (79,393)	$ (75,502)
Net income (loss)	(772)	(1,888)	(1,306)	(1,179)	(2,534)	(74)	(104)
Ending balance	(83,359)	(82,587)	(80,699)	(79,393)	(78,214)	(75,680)	(75,606)	(82,587)	(75,680)	(83,359)	(78,214)	(85,195)	(79,393)
Additional Paid-in Capital
Beginning balance	165,434	164,284	164,180	163,626	163,289	162,856	162,316	164,180	162,316	164,180	162,316	164,180	162,316
Ending balance	165,490	165,434	164,284	164,180	163,626	163,289	162,856	165,434	163,289	165,490	163,626	170,695	164,180
Noncontrolling Interest
Beginning balance	1,153	1,108	1,070	938	904	839	774	1,070	774	1,070	774	1,070	774
Net income (loss)	59	45	38	132	34	65	65
Ending balance	1,212	1,153	1,108	1,070	938	904	839	1,153	904	1,212	938	1,277	1,070
As Previously Reported
Beginning balance	87,377	87,945	88,984	89,352	91,390	90,841	90,215	88,984	90,215	88,984	90,215	88,984	90,215
Net income (loss)	(588)	(1,718)	(1,143)	(922)	(2,375)	116	86	(2,861)	202	(3,449)	(2,173)		(3,095)
Ending balance	86,845	87,377	87,945	88,984	89,352	91,390	90,841	87,377	91,390	86,845	89,352		88,984
As Previously Reported | Common Stock
Beginning balance	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2
Beginning balance (in shares)	21,154,425	20,825,792	20,806,186	20,806,186	20,806,186	20,775,160	20,461,337	20,806,186	20,461,337	20,806,186	20,461,337	20,806,186	20,461,337
Ending balance	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2	$ 2		$ 2
Ending balance (in shares)	21,154,425	21,154,425	20,825,792	20,806,186	20,806,186	20,806,186	20,775,160	21,154,425	20,806,186	21,154,425	20,806,186		20,806,186
As Previously Reported | Accumulated Deficit
Beginning balance	$ (78,059)	$ (76,341)	$ (75,198)	$ (74,276)	$ (71,901)	$ (72,017)	$ (72,103)	$ (75,198)	$ (72,103)	$ (75,198)	$ (72,103)	$ (75,198)	$ (72,103)
Net income (loss)	(588)	(1,718)	(1,143)	(922)	(2,375)	116	86
Ending balance	(78,647)	(78,059)	(76,341)	(75,198)	(74,276)	(71,901)	(72,017)	(78,059)	(71,901)	(78,647)	(74,276)		(75,198)
As Previously Reported | Additional Paid-in Capital
Beginning balance	165,434	164,284	164,180	163,626	163,289	162,856	162,316	164,180	162,316	164,180	162,316	164,180	162,316
Ending balance	165,490	165,434	164,284	164,180	163,626	163,289	162,856	165,434	163,289	165,490	163,626		164,180
Adjustment
Beginning balance	(3,375)	(3,250)	(3,125)	(3,000)	(2,875)	(2,750)	(2,625)	(3,125)	(2,625)	(3,125)	(2,625)	(3,125)	(2,625)
Net income (loss)	(125)	(125)	(125)	(125)	(125)	(125)	(125)	(250)	(250)	(375)	(375)		(500)
Ending balance	(3,500)	(3,375)	(3,250)	(3,125)	(3,000)	(2,875)	(2,750)	(3,375)	(2,875)	(3,500)	(3,000)		(3,125)
Adjustment | Accumulated Deficit
Beginning balance	(4,528)	(4,358)	(4,195)	(3,938)	(3,779)	(3,589)	(3,399)	(4,195)	(3,399)	(4,195)	(3,399)	(4,195)	(3,399)
Net income (loss)	(184)	(170)	(163)	(257)	(159)	(190)	(190)
Ending balance	(4,712)	(4,528)	(4,358)	(4,195)	(3,938)	(3,779)	(3,589)	(4,528)	(3,779)	(4,712)	(3,938)		(4,195)
Adjustment | Noncontrolling Interest
Beginning balance	1,153	1,108	1,070	938	904	839	774	1,070	774	1,070	774	$ 1,070	774
Net income (loss)	59	45	38	132	34	65	65
Ending balance	$ 1,212	$ 1,153	$ 1,108	$ 1,070	$ 938	$ 904	$ 839	$ 1,153	$ 904	$ 1,212	$ 938		$ 1,070