Stockholders’ Equity

Stock Based Compensation

The Company recorded stock-based compensation of

$125,000

and

$206,000

for the

three

and

six

months ended

June 30, 2019,

and

$163,000

and

$300,000

for the

three

and

six

months ended

June 30, 2018,

respectively, as comprised of the following:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
Cost of revenues	$	1,000	$	4,000	$	1,000	$	7,000
Sales and marketing		44,000		9,000		56,000		17,000
Research and development		22,000		28,000		37,000		55,000
General and administrative		58,000		122,000		112,000		221,000
	$	125,000	$	163,000	$	206,000	$	300,000

The following is a summary of option activity for the Company’s stock option plans:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life		Aggregate Intrinsic Value

Outstanding at December 31, 2018		302,368		$	13.99

Forfeited		(16,139	)	$	11.71

Outstanding at June 30, 2019		286,229		$	14.12		9		--

Vested and expected to vest at June 30, 2019		196,219		$	16.92		8.6		--

Exercisable at June 30, 2019		84,804		$	28.17		7.7		--

The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted price of the Company’s common stock. There were

options exercised during the

six

months ended

June 30, 2019.

Warrants

A summary of warrant activity for the

six

months ended

June 30, 2019

follows:

	Number of Shares			Weighted-Average Exercise Price Per Share
Balance at December 31, 2018		1,726,523		$	29.88
Warrants granted (1)		444,445		$	0.10
Warrants expired		(19,637	)	$	417.00
Warrants exercised		(200,000	)	$	0.10

Outstanding at June 30, 2019		1,951,331		$	22.26

Exercisable at June 30, 2019		1,881,478		$	20.11

(

)

See Footnote

of the Notes to the Condensed Consolidated Financial Statements.