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Note 11 - Stock-based Compensation
 3 Months Ended
Mar. 31, 2020
Notes to Financial Statements  
Share-based Payment Arrangement [Text Block]
11.
Stock-Based Compensation
 
The Company records stock-based compensation expense during the requisite service period for share-based payment awards granted to employees and non-employees.
 
The following table sets forth the Company’s stock-based compensation expense (in thousands) for the periods indicated.
 
   
Three Months Ended March 31,
  
   
2020
    
2019
  
                 
Restricted stock
                
Research and development
   $
76
     $
28
  
Selling, general and administrative    
260
      
206
  
                 
Stock appreciation rights                
Research and development    
(79
 )    
16
  
Selling, general and administrative
    
(85
 )    
13
  
                 
Total stock-based compensation
   $
172
     $
263
  
 
Stock Option Award Activity
. Stock option activity under the Company’s stock incentive plans at
March 31, 2020
and changes during the
three
months ended
March 31, 2020
were as follows.
 
 
 
 
 
 
 
 
 
 
 
Weighted-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Average
 
 
 
 
 
 
 
 
 
 
 
Weighted-
 
 
Remaining
 
 
 
 
 
 
 
 
 
 
 
Average
 
 
Contractual
 
 
Aggregate
 
 
 
Number of
 
 
Exercise
 
 
Term
 
 
Intrinsic
 
 
 
Options
 
 
Price
 
 
(years)
 
 
Value
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Options outstanding at December 31, 2019
 
 
1,561
 
 
$
928.79
 
 
 
6.56
 
 
$
—
 
Granted
 
 
—
 
 
$
—
 
 
 
 
 
 
 
 
 
Canceled or forfeited
 
 
—
 
 
$
—
 
 
 
 
 
 
 
 
 
Exercised
 
 
—
 
 
$
—
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Options outstanding at March 31, 2020
 
 
1,561
 
 
$
928.79
 
 
 
6.31
 
 
$
—
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Options exercisable at March 31, 2020
 
 
1,561
 
 
$
928.79
 
 
 
6.31
 
 
$
—
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Options vested and expected to vest at March 31, 2020
 
 
1,561
 
 
$
928.79
 
 
 
6.31
 
 
$
—
 
 
Restricted Stock
. Non-vested restricted stock awards at
March 31, 2020
and changes during the
three
months ended
March 31, 2020
were as follows.
 
 
 
 
 
 
 
Weighted-
 
 
 
 
 
 
 
Average
 
 
 
Number of
 
 
Grant-Date
 
 
 
Shares
 
 
Fair Value
 
 
 
 
 
 
 
 
 
 
Non-vested at December 31, 2019
 
 
1,308,613
 
 
$
1.91
  
Granted
 
 
110,595
 
 
$
1.51
 
Vested
 
 
(19,153
)
 
$
1.87
  
Canceled or forfeited
 
 
(6,974
)
 
$
1.90
 
 
 
 
 
 
 
 
 
 
Non-vested at March 31, 2020
 
 
1,393,081
 
 
$
1.83
  
 
The total fair value of restricted stock that vested during the
three
months ended
March 
31,
2020
totaled 
$0.3
 million. As of
March 31, 2020,
the total unrecognized compensation expense, net of estimated forfeitures, relating to restricted stock awards was
$1.7
 million, which is expected to be recognized over the remaining weighted-average period of approximately
1.2
 years.