Accounts Payable and Accrued Expenses - Schedule of Product Warranty Liability (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued warranty reserve, beginning of year	$ 535,000	$ 472,000
Accrual for product warranties issued	192,000	253,000
Product replacements and other warranty expenditures	(182,000)	(68,000)
Expiration of warranties	(123,000)	(122,000)
Accrued warranty reserve, end of period	$ 422,000	$ 535,000