FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 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):

	June 30, 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	$	180,998	$	—	$	—	$	180,998
Commercial paper		—		159,591		—		159,591
Corporate bonds		—		104,755		—		104,755
Government bonds		—		36,727		—		36,727
Asset-backed securities		—		25,245		—		25,245
Other investments		—		—		7,137		7,137
Total assets	$	180,998	$	326,318	$	7,137	$	514,453
Liabilities:
Contingent consideration	$	—	$	—	$	6,084	$	6,084
Subscription agreement		—		—		474		474
Total liabilities	$	—	$	—	$	6,558	$	6,558

	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

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

	Six Months Ended June 30,
	2021		2020
Balance at beginning of period	$	3,000	$	—
Additions		3,620		—
Changes in fair value		517		—
Balance at end of period	$	7,137	$	—

	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):

	Six Months Ended June 30,
	2021		2020
Balance at beginning of period	$	93,328	$	—
Additions		6,558		—
Changes in fair value		56,576		—
Exercise of private placement warrants		(149,904)		—
Balance at end of period	$	6,558	$	—

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

	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	$	—