Quarterly Financial Information (Unaudited) - Condensed Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Equity method investment loss	$ (125)	$ (125)	$ (125)		$ (125)	$ (125)	$ (125)	$ (250)	$ (250)	$ (375)	$ (375)	$ (501)	$ (511)
Net income (loss) before income taxes	(713)	(1,843)	(1,268)		(2,493)	123	122	(3,111)	245	(3,824)	(2,248)	(5,535)	(3,033)
Loss from continuing operations					(2,493)	123	122		245		(2,248)	(5,595)	(3,235)
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)
Net income attributable to noncontrolling interests	59	45	38		34	65	65	83	130	142	164	207	296
Net income (loss) attributable to common shareholders	$ (772)	$ (1,888)	$ (1,306)		$ (2,534)	$ (74)	$ (104)	$ (3,194)	$ (178)	$ (3,966)	$ (2,712)	$ (5,595)	$ (3,595)
Basic
Continuing operations (attributable to common shareholders)					$ (0.12)	$ 0	$ 0		$ 0.01		$ (0.12)	$ (0.27)	$ (0.17)
Basic earnings (loss) per share	$ (0.04)	$ (0.09)	$ (0.06)		(0.12)		0.01	$ (0.15)	(0.01)	$ (0.19)	(0.13)	(0.27)	(0.19)
Diluted
Continuing operations (attributable to common shareholders)					(0.12)	$ 0	0		$ 0.01		(0.12)	(0.27)	(0.17)
Diluted earnings (loss) per share	$ (0.04)	$ (0.09)	$ (0.06)		$ (0.12)		$ 0.01	$ (0.15)		$ (0.19)	$ (0.13)	$ (0.27)	$ (0.19)
Weighted-average shares outstanding:
Basic								20,850		20,951		21,501	20,716
Diluted								20,850		20,951		21,501	20,716
As Previously Reported
Net income (loss) before income taxes	$ (588)	$ (1,718)	$ (1,143)		$ (2,368)	$ 248	$ 247	$ (2,861)	$ 495	$ (3,449)	$ (1,873)		$ (2,533)
Loss from continuing operations					(2,368)	248	247		495		(1,873)		(2,735)
Net income (loss)	(588)	(1,718)	(1,143)	(922)	(2,375)	116	86	(2,861)	202	(3,449)	(2,173)		(3,095)
Net income (loss) attributable to common shareholders	$ (588)	$ (1,718)	$ (1,143)		$ (2,375)	$ 116	$ 86	$ (2,861)	$ 202	$ (3,449)	$ (2,173)		$ (3,095)
Basic
Continuing operations (attributable to common shareholders)					$ (0.11)	$ 0.01	$ 0.01		$ 0.02		$ (0.09)		$ (0.13)
Basic earnings (loss) per share	$ (0.03)	$ (0.08)	$ (0.05)		(0.11)		0	$ (0.14)	0.01	$ (0.16)	(0.1)		(0.15)
Diluted
Continuing operations (attributable to common shareholders)					(0.11)	$ 0.01	0.01		0.02		(0.09)		(0.13)
Diluted earnings (loss) per share	$ (0.03)	$ (0.08)	$ (0.05)		$ (0.11)		$ 0	$ (0.14)	$ 0.01	$ (0.16)	$ (0.1)		$ (0.15)
Weighted-average shares outstanding:
Basic								20,850		20,951
Diluted								20,850		20,951
Adjustment
Equity method investment loss	$ (125)	$ (125)	$ (125)		$ (125)	$ (125)	$ (125)	$ (250)	$ (250)	$ (375)	$ (375)		$ (500)
Net income (loss) before income taxes	(125)	(125)	(125)		(125)	(125)	(125)	(250)	(250)	(375)	(375)		(500)
Loss from continuing operations					(125)	(125)	(125)		(250)		(375)		(500)
Net income (loss)	(125)	(125)	(125)	$ (125)	(125)	(125)	(125)	(250)	(250)	(375)	(375)		(500)
Net income attributable to noncontrolling interests	59	45	38		34	65	65	83	130	142	164		296
Net income (loss) attributable to common shareholders	$ (184)	$ (170)	$ (163)		$ (159)	$ (190)	$ (190)	$ (333)	$ (380)	$ (517)	$ (539)		$ (500)
Basic
Continuing operations (attributable to common shareholders)					$ (0.01)	$ (0.01)	$ (0.01)		$ (0.01)		$ (0.03)		$ (0.04)
Basic earnings (loss) per share	$ (0.01)	$ (0.01)	$ (0.01)		(0.01)		(0.01)	$ (0.01)	(0.02)	$ (0.03)	(0.03)		(0.04)
Diluted
Continuing operations (attributable to common shareholders)					(0.01)	$ (0.01)	(0.01)		(0.01)		(0.03)		(0.04)
Diluted earnings (loss) per share	$ (0.01)	$ (0.01)	$ (0.01)		$ (0.01)		$ (0.01)	$ (0.01)	$ (0.01)	$ (0.03)	$ (0.03)		$ (0.04)