MARKETABLE SECURITIES AND FAIR VALUE MEASUREMENTS - SCHEDULE OF FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON RECURRING BASIS (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 28,028
Corporate debt securities	7,466
Derivative instruments	1,759
Total liabilities at fair value	1,759
Cash held in banks	90,601	$ 13,908
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	28,028
Corporate debt securities	7,466
Total assets at fair value	35,494	45,614
Derivative instruments	1,759
Total liabilities at fair value	1,759
Fair value, measurements, recurring | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		45,614
Fair value, measurements, recurring | Quoted Prices  in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	28,028
Corporate debt securities	0
Total assets at fair value	28,028	45,614
Derivative instruments	0
Total liabilities at fair value	0
Fair value, measurements, recurring | Quoted Prices  in Active Markets for Identical Assets (Level 1) | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	45,614
Fair value, measurements, recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0
Corporate debt securities	7,466
Total assets at fair value	7,466	0
Derivative instruments	1,759
Total liabilities at fair value	1,759
Fair value, measurements, recurring | Significant Other Observable Inputs (Level 2) | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	0
Corporate debt securities	0
Total assets at fair value	0	0
Derivative instruments	0
Total liabilities at fair value	$ 0
Fair value, measurements, recurring | Significant Unobservable Inputs (Level 3) | Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		$ 0