FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

FAIR VALUE MEASUREMENTS

Schedule of financial assets measured at fair value on a recurring basis

The following fair value hierarchy table presents information about the Company’s financial assets measured at fair value on a recurring basis and indicates the fair value hierarchy of the inputs the Company utilized to determine such fair value (in thousands):

	March 31, 2021
	Quoted Prices in		Significant
	Active Markets		Other		Significant
	for Identical		Observable		Unobservable
	Items		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Money market funds	$	413,089	$	—	$	—	$	413,089
Commercial paper		—		89,835		—		89,835
Corporate bonds		—		61,012		—		61,012
U.S. Treasury securities		5,000		—		—		5,000
Other investments		—		—		3,025		3,025
Total assets	$	418,089	$	150,847	$	3,025	$	571,961

	December 31, 2020
	Quoted Prices in		Significant
	Active Markets		Other		Significant
	for Identical		Observable		Unobservable
	Items		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Money market funds	$	407,512	$	—	$	—	$	407,512
Commercial paper		—		119,285		—		119,285
Corporate bonds		—		47,959		—		47,959
U.S. Treasury securities		19,997		—		—		19,997
Other investments		—		—		3,000		3,000
Total assets	$	427,509	$	167,244	$	3,000	$	597,753
Liabilities:
Private placement warrants	$	—	$	—	$	93,328	$	93,328
Total liabilities	$	—	$	—	$	93,328	$	93,328

Schedule of financial assets and liabilities measured at fair value on a recurring basis

The following fair value hierarchy table presents information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicates the fair value hierarchy of the inputs the Company utilized to determine such fair value (in thousands):

	December 31, 2020
	(as restated)
	Quoted Prices in		Significant
	Active Markets		Other		Significant
	for Identical		Observable		Unobservable
	Items		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Money market funds	$	407,512	$	—	$	—	$	407,512
Commercial paper		—		119,285		—		119,285
Corporate bonds		—		47,959		—		47,959
U.S. Treasury securities		19,997		—		—		19,997
Other investments		—		—		3,000		3,000
Total assets	$	427,509	$	167,244	$	3,000	$	597,753
Liabilities:
Private placement warrants	$	—	$	—	$	93,328	$	93,328
Total liabilities	$	—	$	—	$	93,328	$	93,328

	December 31, 2019
	Quoted Prices in		Significant
	Active Markets		Other		Significant
	for Identical		Observable		Unobservable
	Items		Inputs		Inputs
	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Money market funds	$	40,454	$	—	$	—	$	40,454
Commercial paper		—		19,938		—		19,938
Corporate bonds		—		48,010		—		48,010
Asset‑backed securities		—		16,806		—		16,806
Repurchase agreements		—		25,001		—		25,001
Total assets	$	40,454	$	109,755	$	—	$	150,209

Schedule of Level 3 assets measured at fair value

The following table presents information about the Company’s movement in Level 3 assets measured at fair value (in thousands):

	Three Months Ended March 31,
	2021		2020
Balance at beginning of period	$	3,000	$	—
Changes in fair value		25		—
Balance at end of period	$	3,025	$	—

The following table presents information about the Company’s movement in Level 3 assets measured at fair value (in thousands):

		2020	2019
Balance at beginning of year	$	—	$	—
Additions		3,000		—

Balance at end of year $ 3,000 $ —

Schedule of Movement in Level 3 liabilities measured at fair value

The following table presents information about the Company’s movement in Level 3 liabilities measured at fair value (in thousands):

	Three Months Ended March 31,
	2021		2020
Balance at beginning of period	$	93,328	$	—
Changes in fair value		56,576		—
Exercise of private placement warrants		(149,904)		—
Balance at end of period	$	—	$	—

		2020 (as restated)	2019
Balance at beginning of year	$	—	$	—
Warrant liability assumed		149,745
Change in fair value of warrant liability		(56,417)
Balance at end of year	$	93,328	$	—