Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Summary of Stock Options (Tables)

v3.10.0.1
Note 9 - Summary of Stock Options (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Share-based Compensation, Stock Options, Activity [Table Text Block]
   
Six Months Ended June 30, 2018
 
   
 
 
 
 
 
 
 
 
Weighted
   
 
 
 
   
 
 
 
 
Weighted
   
Average
   
 
 
 
   
Number
   
Average
   
Remaining
   
Aggregate
 
   
of
   
Exercise
   
Contractual
   
Intrinsic
 
   
Shares
   
Price
   
Term (years)
   
Value
 
                                 
Options outstanding, beginning of period
   
2,694,224
    $
5.80
     
8.6
    $
249,154
 
Options granted
   
2,023,559
    $
3.60
     
 
     
 
 
Options exercised
   
-
    $
-
     
 
     
 
 
Options canceled
   
(508,428
)   $
5.66
     
 
     
 
 
Options outstanding, end of period
   
4,209,355
    $
4.76
     
8.8
    $
433,626
 
                                 
Vested and exercisable and expected to vest, end of period
   
3,935,007
    $
4.80
     
8.7
    $
392,290
 
                                 
Vested and exercisable, end of period
   
1,124,400
    $
5.65
     
7.5
    $
10,167
 
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
   
June 30, 2018
   
Price
   
Term (Years)
   
June 30, 2018
   
Price
 
                                               
$1.75
-
$1.97
     
552,500
    $
1.94
     
9.9
     
12,500
    $
1.97
 
$2.64
-
$2.72
     
82,500
    $
2.67
     
9.5
     
9,896
    $
2.64
 
$3.11
-
$3.82
     
319,376
    $
3.63
     
9.2
     
55,730
    $
3.76
 
$4.30
-
$4.97
     
1,477,533
    $
4.52
     
9.0
     
336,424
    $
4.65
 
$5.01
-
$5.67
     
822,652
    $
5.34
     
8.7
     
195,456
    $
5.22
 
$6.00
-
$6.61
     
567,878
    $
6.05
     
7.6
     
326,724
    $
6.00
 
$7.00
-
$7.92
     
348,538
    $
7.65
     
8.2
     
149,292
    $
7.68
 
 
$9.92
 
     
38,135
    $
9.92
     
4.4
     
38,135
    $
9.92
 
$59.60
-
$149.04
     
243
    $
100.46
     
2.5
     
243
    $
100.46
 
 
 
 
     
4,209,355
    $
4.76
     
8.8
     
1,124,400
    $
5.65
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
                         
Expected term (in years)
 
5
   
5
   
5
   
5
 
Average volatility
 
69%
   
48%
   
75%
   
48%
 
Risk-free interest rate
 
2.82%
   
1.76%
   
2.63%
   
1.90%
 
Dividend yield
 
0%
   
0%
   
0%
   
0%
 
   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
                         
Expected term (in years)
 
10
   
10
   
10
   
10
 
Average volatility
 
91%
   
55%
   
91%
   
55%
 
Risk-free interest rate
 
2.85%
   
2.00%
   
2.85%
   
2.29%
 
Dividend yield
 
0%
   
0%
   
0%
   
0%
 
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2018
   
2017
   
2018
   
2017
 
                                 
Cost of revenue
  $
17
    $
4
    $
28
    $
7
 
Research and development
   
65
     
57
     
187
     
108
 
Selling, general and administrative
   
694
     
394
     
1,314
     
712
 
Total
  $
776
    $
455
    $
1,529
    $
827
 
2017 Employee Stock Purchase Plan [Member]  
Notes Tables  
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
June 30, 2018
   
June 30, 2018
 
             
Expected term (in years)
 
0.25
   
0.25
 
Average volatility
 
74%
   
67%
 
Risk-free interest rate
 
1.73%
   
1.58%
 
Dividend yield
 
0%
   
0%