SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Operating lease liabilities	$ 8,399
Operating lease right-of-use assets	$ 8,391		$ 0
Accounting Standards Update 2016-02
Property, Plant and Equipment [Line Items]
Operating lease liabilities		$ 8,600
Operating lease right-of-use assets		$ 8,600