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Cash Equivalents and Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2021

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

At September 30, 2021, cash equivalents and marketable securities consisted of the following (in thousands):

			Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
Money market funds			$	253,079					$	—					$	—					$	253,079
Commercial paper			12,487						—						—						12,487
U.S. treasury debt securities			52,755						4						(28)						52,731
Corporate debt securities			160,945						64						(41)						160,968
Foreign government debt securities			5,037						1						—						5,038
			$	484,303					$	69					$	(69)					$	484,303
Included in cash and cash equivalents			$	253,079					$	—					$	—					$	253,079
Included in marketable securities			$	231,224					$	69					$	(69)					$	231,224

At December 31, 2020, cash equivalents and marketable securities consisted of the following (in thousands):

			Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
Money market funds			$	265,578					$	—					$	—					$	265,578
Commercial paper			21,489						—						—						21,489
U.S. treasury debt securities			51,731						80						(2)						51,809
Corporate debt securities			147,715						214						(47)						147,882
Foreign government debt securities			1,025						2						—						1,027
			$	487,538					$	296					$	(49)					$	487,785
Included in cash and cash equivalents			$	280,578					$	—					$	—					$	280,578
Included in marketable securities			$	206,960					$	296					$	(49)					$	207,207

Schedule of Cash and Cash Equivalents

At September 30, 2021, cash equivalents and marketable securities consisted of the following (in thousands):

			Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
Money market funds			$	253,079					$	—					$	—					$	253,079
Commercial paper			12,487						—						—						12,487
U.S. treasury debt securities			52,755						4						(28)						52,731
Corporate debt securities			160,945						64						(41)						160,968
Foreign government debt securities			5,037						1						—						5,038
			$	484,303					$	69					$	(69)					$	484,303
Included in cash and cash equivalents			$	253,079					$	—					$	—					$	253,079
Included in marketable securities			$	231,224					$	69					$	(69)					$	231,224

At December 31, 2020, cash equivalents and marketable securities consisted of the following (in thousands):

			Amortized Cost						Unrealized Gains						Unrealized Losses						Aggregate Fair Value
Money market funds			$	265,578					$	—					$	—					$	265,578
Commercial paper			21,489						—						—						21,489
U.S. treasury debt securities			51,731						80						(2)						51,809
Corporate debt securities			147,715						214						(47)						147,882
Foreign government debt securities			1,025						2						—						1,027
			$	487,538					$	296					$	(49)					$	487,785
Included in cash and cash equivalents			$	280,578					$	—					$	—					$	280,578
Included in marketable securities			$	206,960					$	296					$	(49)					$	207,207

Summary of Investments Classified by Contractual Maturity Date

The contractual maturities of the investments classified as marketable securities are as follows (in thousands):

			As of September 30, 2021
Due within one year			$	134,115
Due in one to two years			95,098
Due in three to five years			2,011
			$	231,224

Schedule of Available-for-sale Securities, Continuous Unrealized Loss Position

The following table presents gross unrealized losses and fair values for those cash equivalents and marketable securities that were in an unrealized loss position as of September 30, 2021, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in thousands):

			As of September 30, 2021
			Less than 12 months												12 months or greater
			Fair Value						Unrealized Loss						Fair Value						Unrealized Loss
U.S. treasury debt securities			$	34,768					$	(28)					$	—					$	—
Corporate debt securities			73,864						(41)						—						—
Total			$	108,632					$	(69)					$	—					$	—

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Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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