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BUSINESS COMBINATIONS - Additional Information (Details) - Adesis, Inc. [Member]
 12 Months Ended
Jul. 11, 2016
USD ($)
Jun. 23, 2016
USD ($)
Employee
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Business acquisition agreement date     Jun. 23, 2016
Number of employees in contract research organization | Employee   43  
Shares acquired for cash $ 33,900,000 $ 33,872,000  
Transaction closed date     Jul. 11, 2016
Basis for additional consideration payable     if revenues exceed certain threshold levels at the end of each twelve-month period ending December 31, 2016 and December 31, 2017
Business combination, earn-out payments     $ 1,200,000
Contingent consideration   $ 1,670,000 1,900,000
Selling, General and Administrative Expense [Member]      
Business Acquisition [Line Items]      
Business acquisition, transaction costs     360,000
Increase in contingent consideration     195,000
Maximum [Member]      
Business Acquisition [Line Items]      
Additional cash contingent payable upon achievement of milestone $ 2,400,000    
Additional consideration payable upon achievement of each milestone     $ 1,200,000