Operating Segments - Profit by Reportable Segment (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment									2
Segment Reporting Information [Line Items]
Revenue	$ 8,117	$ 10,034	$ 10,795	$ 11,828	$ 18,679	$ 12,159	$ 13,431	$ 12,753	$ 40,774	$ 57,022	$ 48,054
Profit from reportable segments	$ (4,154)	$ (4,558)	$ (5,225)	$ (2,226)	$ 4,020	$ (1,537)	$ 635	$ (3,146)	(16,163)	(28)	(7,652)
Operating segments
Segment Reporting Information [Line Items]
Profit from reportable segments									16,948	27,549	21,018
Residential Segment | Operating segments
Segment Reporting Information [Line Items]
Revenue									14,495	14,686	13,517
Operating expenses									(8,167)	(8,482)	(8,824)
Profit from segment									6,328	6,204	4,693
Commercial Segment | Operating segments
Segment Reporting Information [Line Items]
Revenue									23,313	37,223	32,714
Operating expenses									(12,693)	(15,878)	(16,389)
Profit from segment									$ 10,620	$ 21,345	$ 16,325