Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 340,193	$ 326,303
Less accumulated depreciation	(101,302)	(92,749)
Net property, plant and equipment	238,891	233,554
Mains/lines/sewers
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 145,910	138,173
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	49 years
Plant
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 96,654	94,615
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	31 years
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 37,347	35,497
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	14 years
Meters
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 14,548	14,057
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	13 years
Furniture, fixture and leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,650	623
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	27 years
Computer and office equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,108	785
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	6 years
Software
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 241	241
Average Depreciation Life (in years)
Property plant and equipment, average depreciation life	3 years
Land and land rights
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 1,159	1,051
Other
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	699	700
Construction work-in-process
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 40,877	$ 40,561