The Company (Tables)

12 Months Ended

Dec. 31, 2019

The Company [Abstract]

Accrued Warranty Costs Activity

The activity in the warranty accrual during the years ended December 31, 2019, and 2018, is summarized as follows:

	December 31,
	2019			2018
Accrual at beginning of year	$	238		$	178
Additions charged to warranty expense		222			291
Expiring warranties/claims satisfied		(228	)		(231	)
Total		232			238
Less: current portion		(170	)		(156	)
Total long-term accrued warranty costs	$	62		$	82

Calculation of Basic and Diluted Loss Per Share by Class of Security

The following table presents the calculation of basic and diluted loss per share by each class of security for the years ended December 31, 2019, and 2018:

	Year ended						Year ended
	December 31, 2019						December 31, 2018
	Common Stock			Series C Convertible Preferred Stock			Common Stock			Series C Convertible Preferred Stock
Loss attributable to each class	$	(3,597	)	$	(193	)	$	(2,909	)	$	(1,124	)
Weighted average number of shares outstanding during the period		31,978,665			4,577			19,589,031			20,368
Basic and Diluted loss per share	$	(0.11	)	$	(42.24	)	$	(0.15	)	$	(55.20	)

Antidilutive Securities Excluded from Computation of Earnings Per Share

The following common stock equivalents outstanding during the years ended December 31, 2019, and 2018, have been excluded from the loss per share calculation as their inclusion would have been anti-dilutive:

	Year Ended December 31,
	2019	2018
Common stock purchase warrants	1,517,528	2,397,166
Restricted stock units	128,417	79,068
Common stock options	4,235,451	3,188,897
Total	5,881,396	5,665,131