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FAIR VALUE OF FINANCIAL INSTRUMENTS - Continuous Loss Position (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]  
Fair value of marketable securities, continuous unrealized losses, less than 12 months $ 22,863
Fair value of marketable securities, continuous unrealized losses, 12 months or greater 0
Fair value of marketable securities, continuous unrealized losses 22,863
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]  
Unrealized loss, continuous unrealized losses, less than 12 months (17)
Unrealized loss, continuous unrealized losses, 12 months or greater 0
Unrealized loss, continuous unrealized losses $ (17)