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STOCK-BASED COMPENSATION (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
STOCK-BASED COMPENSATION [Abstract]        
Non-cash compensation expense $ 383,000 $ 655,000 $ 382,657 $ 942,226
Weighted-average assumptions used for options granted        
Risk-free interest rate (in hundredths)     0.90% 2.10%
Expected volatility (in hundredths)     102.00% 101.00%
Dividend yield (in hundredths)     0.00% 0.00%
Expected option term     5 years 5 years
Options [Abstract]        
Outstanding at beginning of period (in shares)     695,000  
Granted (in shares)     40,517  
Exercised (in shares)     (205,000)  
Outstanding and expected to vest, at end of period (in shares) 530,517   530,517  
Weighted average Exercise Price [Abstract]        
Outstanding at beginning of period (in dollars per share)     $ 6.68  
Granted (in dollars per share)     $ 11.87  
Exercised (in dollars per share)     $ 6.65  
Outstanding and expected to vest, at end of period (in dollars per share) $ 9.25   $ 9.25  
Weighted average remaining contractual term [Abstract]        
Outstanding and expected to vest, at end of period     3 years 1 month 17 days  
Aggregate Intrinsic Value [Abstract]        
Outstanding and expected to vest, at end of period 1,285,746   1,285,746  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options issued (in shares)     (205,000)  
Proceeds from exercise of stock options     1,224,515 251,950
Intrinsic value of options exercised     1,252,950 1,514,000
Issue of Stock for Cash [Member]
        
Options [Abstract]        
Exercised (in shares)     170,000  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options issued (in shares)     170,000  
Proceeds from exercise of stock options     1,122,700  
Issue of Stock for Noncash Consideration [Member]
        
Options [Abstract]        
Exercised (in shares)     10,000  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options issued (in shares)     10,000  
Exchange of common stock upon exercise of stock options (in shares)     4,589  
Fair market value of common stock upon exercise of options     69,095  
Issue of Stock for Cash and Noncash Consideration [Member]
        
Options [Abstract]        
Exercised (in shares)     25,000  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options issued (in shares)     25,000  
Proceeds from exercise of stock options     102,815  
Exchange of common stock upon exercise of stock options (in shares)     4,333  
Fair market value of common stock upon exercise of options     $ 69,930