Product Line, Geographic, Significant Customer and Concentration of Credit Risk Data - Schedule of Percentage of Total Sales and Accounts Receivable from Customer (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Percentage of total sales	100.00%	100.00%
Residential Customers \| Customer A
Segment Reporting Information [Line Items]
Percentage of total sales	10.40%
Percentage of accounts receivable		14.10%
Commercial Customers \| Customer B
Segment Reporting Information [Line Items]
Percentage of accounts receivable	16.20%	16.80%
Commercial Customers \| Customer C
Segment Reporting Information [Line Items]
Percentage of total sales	10.80%
Percentage of accounts receivable	15.70%	15.70%
Commercial Customers \| Customer D
Segment Reporting Information [Line Items]
Percentage of accounts receivable	10.80%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration