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Stock Plans and Share-Based Payments (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
May 07, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Selling, general and administrative expense $ 1,403 $ 1,091   $ 2,906 $ 2,351  
Income tax expenses benefit      
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options 1,270     1,270    
Employee service share-based compensation, nonvested awards, compensation recognized at the time of certain performance conditions met 231     231    
Stock based compensation recognized amortization cost       $ 1,039    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition       1 year 9 months 18 days    
2019 SRP Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense 3     $ 3    
Selling, general and administrative expense 1     1    
Research and development expense 2     2    
Number of common stock reserved for issuance           150
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense 15 103   30 215  
Selling, general and administrative expense 14 90   28 190  
Research and development expense 1 13   2 25  
Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation expense 132 124   275 253  
Selling, general and administrative expense 118 118   242 237  
Research and development expense $ 14 $ 6   $ 33 16  
Stock option modification expense         $ 12  
Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted         11,111  
Cashless exercise of stock options, shares     2,471   2,471  
Employees, Directors And Consultant [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted       72,574    
Fair value of stock option granted       $ 313    
Directors and One Employee [Member] | 2019 SRP Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options granted 23,040     23,040    
Fair value of stock option granted $ 88     $ 88