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STOCK OPTIONS (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock options and stock awards
The status of our stock options and stock awards are summarized as follows:
 
Number of options
 
Weighted average exercise price
Outstanding at December 31, 2015
3,131,447

 
$
3.38

Granted
810,762

 
1.87

Exercised
(36,250
)
 
3.62

Canceled and forfeited
(153,750
)
 
3.69

Outstanding at December 31, 2016
3,752,209

 
$
3.04

Granted
1,728,000

 
3.09

Exercised
(176,750
)
 
2.41

Canceled and forfeited
(443,302
)
 
3.95

Outstanding at December 31, 2017
4,860,157

 
$
3.00

 
 
 
 
Exercisable at December 31, 2017
2,627,722

 
$
3.46
Number of weighted average grant-date fair values of options
 
Number of options
 
Weighted average grant date fair value
Non-vested at December 31, 2016
1,745,506

 
$
1.25

Granted
1,728,000

 
1.82

Vested
(797,769
)
 
1.01

Forfeited
(443,302
)
 
1.95

Non-vested at December 31, 2017
2,232,435

 
1.40
Schedule of option fair value assumptions
 
2017 Grants
 
2016 Grants
 
2015 Grants
Option value
$1.73
-
$2.34
 
$0.80
-
$0.91
 
$0.90
-
$1.84
Risk-free rate
1.5%
-
1.9%
 
1.5%
-
1.8%
 
0.2%
 
1.6%
Expected dividend yield
—%
 
—%
 
—%
Expected volatility
62.1%
-
68.0%
 
49.5%
-
50.3%
 
53.0%
-
54.0%
Expected term (in years)
6
 
6
 
6
Allocation of stock based compensation
Allocation of stock based compensation expense was as follows:
 
Year Ended December 31,
(In thousands)
2017
 
2016
 
2015
Cost of sales
$
—

 
$
2

 
$
3

Research and development
27

 
27

 
39

Salaries and related costs
844

 
780

 
526

Total
$
871

 
$
809

 
$
568