Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

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 12/31/16		Weighted Average Remaining Contractual Life (years)		Weighted Average Exercise Price		Number Exercisable at 12/31/16		Weighted Average Exercise Price
$ 1.44 -  $ 3.50		200,000		5.30	$	2.85		147,083	$	2.78
$ 3.51 -   $ 5.00		1,426,000		2.85	$	4.23		1,426,000	$	4.23
$ 5.01 -   $ 6.50		130,000		3.63	$	5.98		129,166	$	5.98
$ 6.51 -   $ 8.21		90,000		0.02	$	8.21		90,000	$	8.21
		1,846,000		3.03	$	4.39		1,792,249	$	4.43

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	%

	For the year ended
	December 31, 2014
Annual dividend yield		-
Expected life (years)		3.5
Risk-free interest rate		0.28% - 1.47	%
Expected volatility		60.68% - 108.75	%

Summary of stock-based compensation expense

	Years ended
	December 31,
	2016		2015		2014
Research and development	$	48	$	484	$	510
Sales and marketing		150		296		353
General and administrative		57		295		866
Stock compensation expense	$	255	$	1,075	$	1,729

	Remaining unrecognized expense at  December 31, 2016
Stock-based compensation	$	84

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, 2014		1,600,583		$	5.22
Options granted		405,200			6.31
Options exercised		-			-
Options cancelled or expired		(296,383	)		5.46
Options outstanding – December 31, 2014		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		3.03	$	10,000
Options exercisable and expected to vest – December 31, 2016		1,846,000		$	4.39		3.03	$	10,000