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STOCK-BASED COMPENSATION (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 42 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
2000 Option Plan
Dec. 31, 2013
2000 Option Plan
Minimum
Dec. 31, 2013
2000 Option Plan
Maximum
Dec. 31, 2013
2000 Option Plan
Options
Dec. 31, 2013
2000 Option Plan
Restricted stock
Jul. 25, 2013
2010 Stock Plan
Dec. 31, 2013
2010 Stock Plan
Dec. 31, 2013
2010 Stock Plan
Minimum
Dec. 31, 2013
2010 Stock Plan
Maximum
Dec. 31, 2013
2010 Stock Plan
Options
Dec. 31, 2013
2010 Stock Plan
Restricted stock
Dec. 31, 2013
2010 Purchase Plan
Dec. 31, 2012
2010 Purchase Plan
Dec. 31, 2011
2010 Purchase Plan
Dec. 31, 2013
2010 Purchase Plan
Dec. 31, 2013
2010 Purchase Plan
April 30, 2013
Dec. 31, 2013
2010 Purchase Plan
October 31, 2013
Dec. 31, 2013
2010 Purchase Plan
Minimum
item
Dec. 31, 2013
2010 Purchase Plan
Maximum
Stock-based compensation                                            
Further grants or awards after termination of plan (in shares)       0           0                        
Expiration period from the date of grant             10 years           10 years                  
Vesting period         3 years 4 years         3 years 4 years                    
Period by which all options to purchase common stock will accelerate upon an acquisition of the company       1 year           1 year                        
Period from the completion of acquisition, during which if an employee is terminated without cause or for good reason, all awards then outstanding held by that employee will immediately become exercisable                   1 year                        
Shares outstanding             4,582,064 27,000         1,480,523 1,123,694                
Increase in number of shares reserved for issuance                 2,800,000                          
Shares available for future grant 2,980,421                 2,852,078         128,343     128,343        
Number of hours per week of customary employment required to participate in the plan                                         20  
Number of months of customary employment required to participate in the plan                                         5 months  
Percentage of employee's compensation to be deducted from the employee's pay                                         1.00% 15.00%
Option exercise price, expressed as a percentage of fair market value                             85.00%              
Maximum value of shares that an employee is permitted to purchase                             $ 25,000              
Number of Shares 59,932 63,611 51,857                       59,932 63,611 51,857 171,657 33,338 26,594    
Weighted Average Price per Share (in dollars per share)                                     $ 7.56 $ 7.55    
Proceeds from stock option exercise $ 1,300,000 $ 2,400,000 $ 700,000                       $ 500,000 $ 400,000 $ 300,000