Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of options outstanding by exercise price range

Options Outstanding					Options Exercisable
Range of Exercise Price	Number Outstanding at 12/31/17		Weighted Average Remaining Contractual Life (years)		Weighted Average Exercise Price		Number Exercisable at 12/31/17		Weighted Average Exercise Price
$ 1.44 -  $ 3.50		200,000		4.30	$	2.85		190,000	$	2.84
$ 3.51 -   $ 5.00		1,426,000		1.85	$	4.23		1,426,000	$	4.23
$ 5.01 -   $ 6.21		130,000		2.63	$	5.98		130,000	$	5.98
		1,756,000		2.18	$	4.20		1,746,000	$	4.21

Summary of assumptions used to value stock options granted to employees and directors

	For the year ended
	December 31, 2016
Annual dividend yield		-
Expected life (years)		3.5
Risk-free interest rate		0.83	%
Expected volatility		65.46	%

	For the year ended
	December 31, 2015
Annual dividend yield		-
Expected life (years)		2.97
Risk-free interest rate		0.47% - 1.41	%
Expected volatility		60.07% - 72.33	%

Summary of stock-based compensation expense

	Years ended
	December 31,
	2017		2016		2015
(In thousands)
Research and development	$	-	$	48	$	484
Sales and marketing		50		150		296
General and administrative		22		57		295
Stock-based compensation expense	$	72	$	255	$	1,075

(In thousands)	Remaining unrecognized expense at  December 31, 2017
Stock-based compensation	$	11

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of all stock option plans / warrant activity

	Options Outstanding
						Weighted-
						Average
				Weighted-		Remaining
				Average		Contractual		Aggregate
	Number of			Exercise		Life		Intrinsic
	Shares			Price		(in years)		Value
Options outstanding – January 1, 2015		1,709,400		$	4.92
Options granted		605,000			3.57
Options exercised		-			-
Options cancelled or expired		(130,283	)		6.03
Options outstanding – December 31, 2015		2,184,117		$	4.48
Options granted		25,000			1.44
Options exercised		-			-
Options cancelled or expired		(363,117	)		4.73
Options outstanding – December 31, 2016		1,846,000		$	4.39
Options granted		-			-
Options exercised		-			-
Options cancelled or expired		(90,000	)		8.21
Options outstanding – December 31, 2017		1,756,000		$	4.20		2.18	$	-
Options exercisable and expected to vest – December 31, 2017		1,756,000		$	4.20		2.18	$	-