Annual report pursuant to Section 13 and 15(d)

Note 10 - Summary of Stock Options (Tables)

v3.19.1
Note 10 - Summary of Stock Options (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Year Ended December 31, 2018
 
   
 
 
 
 
 
 
 
 
Weighted
   
 
 
 
   
 
 
 
 
Weighted
   
Average
   
 
 
 
   
Number
   
Average
   
Remaining
   
Aggregate
 
   
of
   
Exercise
   
Contractual
   
Intrinsic
 
   
Shares
   
Price
   
Term (years)
   
Value
 
Options outstanding, December 31, 2016
   
1,909,764
    $
6.19
     
9.1
    $
211,396
 
Options granted
   
1,000,985
    $
5.68
     
 
     
 
 
Options exercised
   
(7,730
)   $
4.02
     
 
     
 
 
Options canceled
   
(208,795
)   $
8.88
     
 
     
 
 
Options outstanding, December 31, 2017
   
2,694,224
    $
5.80
     
8.6
    $
249,154
 
Options granted
   
2,358,559
    $
3.52
     
 
     
 
 
Options exercised
   
-
    $
-
     
 
     
 
 
Options canceled
   
(1,038,308
)   $
5.43
     
 
     
 
 
Options outstanding, December 31, 2018
   
4,014,475
    $
4.56
     
7.4
    $
-
 
                                 
Vested and exercisable and expected to vest, end of period
   
3,825,887
    $
4.98
     
7.3
    $
-
 
                                 
Vested and exercisable, end of period
   
1,637,474
    $
5.44
     
5.0
    $
-
 
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
   
Dec 31, 2018
   
Price
   
Term (Years)
   
Dec 31, 2018
   
Price
 
                                               
                                               
$1.75
-
$1.97
     
535,000
    $
1.95
     
9.4
     
50,000
    $
1.97
 
$2.02
-
$2.83
     
180,000
    $
2.40
     
9.4
     
11,459
    $
1.97
 
$3.03
-
$3.82
     
546,876
    $
3.53
     
9.1
     
64,090
    $
2.64
 
$4.30
-
$4.97
     
1,247,318
    $
4.54
     
7.3
     
503,934
    $
3.76
 
$5.01
-
$5.67
     
693,067
    $
5.36
     
6.8
     
397,466
    $
4.62
 
$6.00
-
$6.61
     
490,470
    $
6.04
     
4.1
     
412,662
    $
5.34
 
$7.00
-
$7.92
     
283,599
    $
7.65
     
7.4
     
159,718
    $
6.02
 
$9.92
     
38,135
    $
9.92
     
1.3
     
38,135
    $
7.66
 
$59.60
-
$149.04
     
10
    $
149.04
     
2.8
     
10
    $
9.92
 
 
 
 
     
4,014,475
    $
4.56
     
7.4
     
1,637,474
    $
5.44
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Year Ended
 
   
December 31,
 
   
2018
   
2017
 
                 
Expected term (in years)
   
5
     
5
 
Average volatility
   
73%
     
59%
 
Risk-free interest rate
   
2.65%
     
1.89%
 
Dividend yield
   
0%
     
0%
 
   
Year Ended
 
   
December 31,
 
   
2018
   
2017
 
                 
Expected term (in years)
   
9
     
10
 
Average volatility
   
69%
     
72%
 
Risk-free interest rate
   
2.69%
     
2.38%
 
Dividend yield
   
0%
     
0%
 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Year Ended
 
   
December 31,
 
   
2018
   
2017
 
                 
Cost of revenue
  $
69
    $
19
 
Research and development
   
328
     
252
 
Selling, general and administrative
   
2,638
     
1,601
 
Total
  $
3,035
    $
1,872
 
2017 Employee Stock Purchase Plan [Member]  
Notes Tables  
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
   
Year Ended
 
   
December 31,
 
   
2018
   
2017
 
                 
Expected term (in years)
   
0.25
     
0.25
 
Average volatility
   
72%
     
61%
 
Risk-free interest rate
   
1.92%
     
1.06%
 
Dividend yield
   
0%
     
0%