Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Liabilities

Accounts payable and accrued expenses consist of the following:

	December 31,
	2017		2018
Accounts payable	$	6,233,000	$	6,644,000
Accrued warranty		535,000		422,000
Accrued severance		100,000		-
Accrued compensation		507,000		870,000
Other current liabilities		65,000		91,000
	$	7,440,000	$	8,027,000

Schedule of Product Warranty Liability

The following table summarizes warranty activity during the years ended December 31, 2017 and 2018:

	Year Ended
	2017			2018
Accrued warranty reserve, beginning of year	$	472,000		$	535,000
Accrual for product warranties issued		253,000			192,000
Product replacements and other warranty expenditures		(68,000	)		(182,000	)
Expiration of warranties		(122,000	)		(123,000	)
Accrued warranty reserve, end of period	$	535,000		$	422,000