Available-for-Sale Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2021

Investments Debt And Equity Securities [Abstract]

Summary of Available-for-Sale Marketable Securities by Major Type of Security

As of June 30, 2021

			Gross Unrealized				Estimated Fair
Type of Security	Amortized Cost		Gains		Losses		Value
U.S. Treasury securities	$	10,106	$	3	$	—	$	10,109
U.S. government agency obligations		14,572		5		(10)		14,567
Corporate bonds		44,850		15		(31)		44,834
Commercial paper		99,705		13		(1)		99,717
Municipal bonds		15,829		17		(16)		15,830
Total available-for-sale marketable securities	$	185,062	$	53	$	(58)	$	185,057

As of December 31, 2020

			Gross Unrealized				Estimated Fair
Type of Security	Amortized Cost		Gains		Losses		Value
U.S. Treasury securities	$	20,710	$	41	$	(1)	$	20,750
U.S. government agency obligations		22,125		4		(1)		22,128
Corporate bonds		49,080		61		(23)		49,118
Commercial paper		116,139		5		(17)		116,127
Municipal bonds		11,680		12		(8)		11,684
Total available-for-sale marketable securities	$	219,734	$	123	$	(50)	$	219,807

Schedule of Fair Values and Continuous Unrealized Loss Positions of Available-for-Sale Marketable Securities

As of June 30, 2021

	Less than 12 Months				12 Months or Greater				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
U.S. government agency obligations	$	6,990	$	(10)	$	—	$	—	$	6,990	$	(10)
Corporate bonds		30,166		(31)		—		—		30,166		(31)
Commercial paper		9,492		(1)		—		—		9,492		(1)
Municipal bonds		6,404		(16)		—		—		6,404		(16)
Total	$	53,052	$	(58)	$	—	$	—	$	53,052	$	(58)

As of December 31, 2020

	Less than 12 Months				12 Months or Greater				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
U.S. Treasury securities	$	12,682	$	(1)	$	—	$	—	$	12,682	$	(1)
U.S. government agency obligations		2,500		(1)		—		—		2,500		(1)
Corporate bonds		23,553		(23)		—		—		23,553		(23)
Commercial paper		68,897		(17)		—		—		68,897		(17)
Municipal bonds		6,259		(8)		—		—		6,259		(8)
Total	$	113,891	$	(50)	$	—	$	—	$	113,891	$	(50)

Schedule of Amortized Cost and Fair Values of Marketable Debt Securities by Contractual Maturity

	As of June 30, 2021				As of December 31, 2020
Contractual maturity	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Less than one year	$	132,817	$	132,841	$	149,164	$	149,242
One year to three years		52,245		52,216		70,570		70,565
Total	$	185,062	$	185,057	$	219,734	$	219,807