FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of September 30, 2021 (in thousands):

			Fair Value Measurements, Using
	Total Carrying Value as of September 30,  2021		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents	$	312,324	$	312,324	$	—	$	—
Short-term investments		253,786		253,786		—		—
Convertible notes		500		—		—		500

The following table provides the assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2020 (in thousands):

			Fair Value Measurements, Using
	Total Carrying Value as of December 31,  2020		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents	$	466,233	$	466,233	$	—	$	—
Short-term investments		99,996		99,996		—		—