BUSINESS COMBINATIONS - Additional Information (Details) - Adesis, Inc. [Member]			12 Months Ended
	Jul. 11, 2016 USD ($)	Jun. 23, 2016 USD ($) Employee	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	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 exceeded certain threshold levels at the end of each twelve-month period ended December 31, 2016 and December 31, 2017.
Additional cash consideration earned by former shareholders				$ 1,200,000	$ 1,200,000
Selling, General and Administrative Expense [Member]
Business Acquisition [Line Items]
Business acquisition, transaction costs					$ 360,000
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