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CASH, CASH EQUIVALENTS, RESTRICTED CASH AND MARKETABLE SECURITIES - Summary of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]        
Cash and cash equivalents $ 477,755 $ 338,489 $ 287,660 $ 409,632
Restricted cash 748 1,748 1,000 188
Total cash, cash equivalents and restricted cash $ 478,503 $ 340,237 $ 288,660 $ 409,820