Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

Investments Debt And Equity Securities [Abstract]

Schedule of Estimated Fair Value of Cash Equivalents and Marketable Securities

The following tables summarize the estimated fair value of the Company’s cash equivalents and marketable securities and the gross unrealized gains and losses (in thousands):

	March 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents
Money market funds	$	73,798	$	—	$	—		$	73,798
Marketable securities
U.S. treasury securities	$	46,427	$	3	$	(1	)	$	46,429

	December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents
Money market funds	$	6,700	$	—	$	—		$	6,700
U.S. treasury securities		4,005		—		(1	)		4,004
U.S. government agency securities		66,895		—		(2	)		66,893
Total cash equivalents		77,600		—		(3	)		77,597
Marketable securities
U.S. treasury securities		53,183		1		(7	)		53,177
Corporate bonds		3,000		1		—			3,001
Total marketable securities	$	56,183	$	2	$	(7	)	$	56,178

Schedule of Gross Unrealized Losses and Fair Value by Investment Category and Age

The following table summarizes the available-for-sale securities in an unrealized loss position for which an allowance for credit losses has not been recorded as of March 31, 2021 and December 31, 2020, aggregated by major security type and length of time in a continuous unrealized loss position:

	March 31, 2021
	Less Than 12 Months					12 Months or Longer				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. treasury securities	$	4,031	$	(1	)	$	—	$	—	$	4,031	$	(1	)

	December 31, 2020
	Less Than 12 Months					12 Months or Longer				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
U.S. treasury securities	$	43,183	$	(8	)	$	—	$	—	$	43,183	$	(8	)
U.S. government agency securities		66,893		(2	)		—		—		66,893		(2	)
Total marketable securities	$	110,076	$	(10	)	$	—	$	—	$	110,076	$	(10	)

Summary of Contractual Maturities of Marketable Securities at Estimated Fair Value

The following table summarizes the contractual maturities of the Company’s marketable securities at estimated fair value (in thousands):

	March 31,		December 31,
	2021		2020
Due in one year or less	$	46,429	$	56,178
Due in 1 - 2 years		—		—
Total marketable securities	$	46,429	$	56,178