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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Schedule of Expected Available-for-sale Securities Maturity (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Fair Value Disclosures [Abstract]  
One year or less $ 3,681
After one year through five years 11,422
After five years through 10 years 234
After 10 years 3,469
Available-for-sale debt securities total fair value $ 18,806