FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

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

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy used to determine such fair values:

	Fair value measurements at December 31, 2020 using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	32,501	$	—	$	—	$	32,501
Investments:
Commercial paper	—		35,559		—		35,559
Corporate bonds	—		192,573		—		192,573
U.S. Government agencies	—		52,330		—		52,330
Total	$	32,501	$	280,462	$	—	$	312,963

	Fair value measurements at December 31, 2019 using:
	Level 1		Level 2		Level 3		Total
Assets:
Money market funds	$	24,157	$	—	$	—	$	24,157
Total	$	24,157	$	—	$	—	$	24,157
Liabilities:
Derivative liabilities	$	—	$	—	$	16	$	16
Total	$	—	$	—	$	16	$	16

Reconciliation of Fair Value Liabilities

Derivative liabilities consisted of the following:

	Derivative liabilities
Balance - December 31, 2018	$	4,023
Change in fair value	6,393
Exercise of series B preferred stock tranche right	(10,400)
Balance - December 31, 2019	16
Reclassification to additional paid-in capital in connection with IPO	(16)
Balance - December 31, 2020	$	—