CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Marketable Securities Classified as Short-term and Long-term (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Cash, Cash Equivalents and Marketable Securities [Line Items]
Amortized Cost	$ 9,270	$ 50,414
Unrealized Gains	7	168
Fair Value	9,277	50,582
Short-term marketable securities
Cash, Cash Equivalents and Marketable Securities [Line Items]
Amortized Cost	9,270	47,852
Unrealized Gains	7	117
Fair Value	9,277	47,969
Short-term marketable securities | U.S. government and municipal obligations
Cash, Cash Equivalents and Marketable Securities [Line Items]
Amortized Cost	3,571	28,621
Unrealized Gains	7	107
Fair Value	3,578	28,728
Short-term marketable securities | Commercial paper
Cash, Cash Equivalents and Marketable Securities [Line Items]
Amortized Cost	5,699	14,644
Unrealized Gains	0	0
Fair Value	5,699	14,644
Short-term marketable securities | Corporate bonds
Cash, Cash Equivalents and Marketable Securities [Line Items]
Amortized Cost		4,587
Unrealized Gains		10
Fair Value		4,597
Long-term marketable securities
Cash, Cash Equivalents and Marketable Securities [Line Items]
Amortized Cost	0	2,562
Unrealized Gains	0	51
Fair Value	$ 0	2,613
Long-term marketable securities | U.S. government and municipal obligations
Cash, Cash Equivalents and Marketable Securities [Line Items]
Amortized Cost		2,562
Unrealized Gains		51
Fair Value		$ 2,613