CASH EQUIVALENTS AND MARKETABLE SECURITIES - (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

The table below summarizes the Company’s cash equivalents and marketable securities (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Estimated Fair Value
September 30, 2021
Assets
Cash equivalents:
Money market funds	$	124,592	$	—	$	—	$	124,592
Total	124,592		—		—		124,592
Marketable securities:
U.S. government-sponsored entity debt securities	87,159		12		(4)		87,167
Commercial paper securities	98,046		24		(5)		98,065
Corporate debt securities	33,697		3		(6)		33,694
Asset-backed securities	74,350		7		(31)		74,326
Certificate of deposits	48,828		11		(1)		48,838
Total	342,080		57		(47)		342,090
Total cash equivalents and marketable securities	$	466,672	$	57	$	(47)	$	466,682
December 31, 2020
Assets
Cash equivalents:
Money market funds	$	53,165	$	—	$	—	$	53,165
Total	53,165		—		—		53,165
Marketable securities:
U.S. government-sponsored entity debt securities	257,284		19		(5)		257,298
Commercial paper securities	213,500		41		(8)		213,533
Corporate debt securities	59,575		16		(17)		59,574
Asset-backed securities	17,905		10		(7)		17,908
Certificate of deposits	12,311		—		—		12,311
Total	560,575		86		(37)		560,624
Total cash equivalents and marketable securities	$	613,740	$	86	$	(37)	$	613,789

Fair value of investments available-for-sale

The fair value of marketable securities by contractual maturity were as follows (in thousands):

	September 30, 2021		December 31, 2020
Maturing in one year or less	$	246,460	$	510,094
Maturing after one year through five years	95,630		50,530
Total	$	342,090	$	560,624