Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Summary of Stock Options (Tables)

v3.8.0.1
Note 9 - Summary of Stock Options (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Nine Months Ended September 30, 2017
 
   
 
 
 
 
 
 
 
 
Weighted
   
 
 
 
   
 
 
 
 
Weighted
   
Average
   
Aggregate
 
   
Number
   
Average
   
Remaining
   
Intrinsic
 
   
of
   
Exercise
   
Contractual
   
Value
 
   
Shares
   
Price
   
Term (years)
   
(in thousands)
 
                                 
Options outstanding, beginning of period
   
1,909,764
    $
6.19
     
9.12
    $
211,396
 
Options granted
   
739,985
    $
5.86
     
 
     
 
 
Options exercised
   
(7,730
)   $
4.02
     
 
     
 
 
Options cancelled
   
(152,040
)   $
9.82
     
 
     
 
 
Options outstanding, end of period
   
2,489,979
    $
5.88
     
8.70
    $
387,178
 
                                 
Vested and exercisable and expected to vest, end of period
   
2,337,350
    $
5.88
     
8.67
    $
369,478
 
                                 
Vested and exercisable, end of period
   
734,721
    $
5.90
     
7.81
    $
162,632
 
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]
       
Options Outstanding
   
Options Exercisable
 
       
 
 
 
 
 
 
 
 
Weighted
   
 
 
 
 
 
 
 
       
Number
   
Weighted
   
Average
   
Number
   
Weighted
 
       
Outstanding
   
Average
   
Remaining
   
Exercisable
   
Average
 
Range of
 
as of
   
Exercise
   
Contractual
   
as of
   
Exercise
 
Exercise Prices
 
September 30, 2017
   
Price
   
Term (Years)
   
September 30, 2017
   
Price
 
                                             
 
$2.64
 
   
12,500
    $
2.64
     
7.62
     
7,553
    $
2.64
 
$3.68
-
$3.76
   
66,876
    $
3.76
     
7.35
     
43,191
    $
3.76
 
$4.46
-
$4.92
   
400,329
    $
4.63
     
8.25
     
161,941
    $
4.77
 
 
$5.22
 
   
567,679
    $
5.22
     
9.20
     
108,555
    $
5.22
 
$5.58
-
$5.67
   
254,000
    $
5.62
     
9.93
     
-
    $
-
 
 
$6.00
 
   
557,753
    $
6.00
     
8.22
     
244,023
    $
6.00
 
$6.24
-
$6.61
   
150,639
    $
6.44
     
8.21
     
45,574
    $
6.34
 
$7.00
-
$7.92
   
441,825
    $
7.65
     
9.10
     
85,506
    $
7.72
 
 
$9.92
 
   
38,135
    $
9.92
     
5.14
     
38,135
    $
9.92
 
$56.00
-
$296.00
   
243
    $
100.46
     
3.21
     
243
    $
100.46
 
 
 
 
   
2,489,979
    $
5.88
     
8.70
     
734,721
    $
5.90
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
     
Three Months Ended
   
Nine Months Ended
     
September 30,
   
September 30,
     
2017
   
2016
   
2017
   
2016
                                 
Expected term (in years)
   
5
     
5
     
5
     
5
 
Average volatility
   
64
%    
46
%    
55
%    
54
%
Risk-free interest rate
   
1.73
%    
1.14
%    
1.83
%    
1.31
%
Dividend yield
   
0
%    
0
%    
0
%    
0
%
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
   
Nine Months Ended
 
   
September 30,
   
September 30,
 
   
2017
   
2016
   
2017
   
2016
 
                                 
Cost of revenue   $
5
    $
-
    $
12
    $
-
 
Research and development
   
62
     
31
     
170
     
80
 
Selling, general and administrative
   
420
     
241
     
1,132
     
582
 
Total
  $
487
    $
272
    $
1,314
    $
662