Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Additional Information (Details)

v3.19.1
SHARE-BASED COMPENSATION - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2012
Jul. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation $ 1,753,000 $ 2,707,000 $ 2,552,000    
Share-based compensation reclassified 318,000        
Stock Option Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized for issuance (in shares)         1,000,000
Unrecognized compensation costs related to non-vested share-based compensation $ 0        
Stock Option Plans | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Term of expiration period 10 years        
Granted (in shares) 0        
Weighted average grant date fair value (in dollars per share) $ 0 $ 0 $ 0    
Proceeds from stock options exercised $ 912,000 $ 25,000 $ 11,000    
Shares issued upon option and warrant exercise (in shares) 268,000        
Fair value of options vested in period $ 1,533,000        
Stock Option Plans | Stock Options and Warrants          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issued during the period (in shares) 0 0 0    
Intrinsic value of options and warrants exercised $ 2,630,000 $ 164,000 $ 237,000    
Exercised in period (in shares) 378,000        
Stock Option Plans | Mr. Hatem El Khalidi | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation reclassified $ 680,000 $ 0      
Stock Option Plans | Common Stock | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options in the money (in shares) 500,000        
The Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized for issuance (in shares)       1,500,000  
The Plan | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation costs related to non-vested restricted share-based compensation $ 2,500,000        
Weighted average period compensation cost expected to be recognized 1 year 10 months 24 days        
Minimum | Stock Option Plans | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 4 years        
Minimum | The Plan | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 2 years 6 months        
Maximum | Stock Option Plans | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 5 years        
Maximum | The Plan | Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 5 years