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, 2017	Dec. 31, 2016
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	10.70%
Percentage of accounts receivable	0.00%
Residential Customers | Customer B
Segment Reporting Information [Line Items]
Percentage of accounts receivable		0.00%
Commercial Customers | Customer C
Segment Reporting Information [Line Items]
Percentage of accounts receivable	0.00%
Commercial Customers | Customer D
Segment Reporting Information [Line Items]
Percentage of accounts receivable	0.00%
Commercial Customers | Customer E
Segment Reporting Information [Line Items]
Percentage of accounts receivable		0.00%