Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2020

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):

	June 30, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents
Money market funds	$	43,306	$	—	$	—		$	43,306
U.S. treasury securities		5,499		—		—			5,499
U.S. government agency securities		4,999		—		—			4,999
Total cash equivalents		53,804		—		—			53,804
Marketable securities
U.S. treasury securities		65,966		3		(4	)		65,965
U.S. government agency securities		5,535		—		—			5,535
Commercial paper		1,748		3		—			1,751
Corporate bonds		18,729		38		(1	)		18,766
Total marketable securities	$	91,978	$	44	$	(5	)	$	92,017

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents
Money market funds	$	7,023	$	—	$	—		$	7,023
Reverse repurchase agreements		6,250		—		—			6,250
Commercial paper		2,247		—		—			2,247
Total cash equivalents		15,520		—		—			15,520
Marketable securities
Commercial paper		12,931		15		—			12,946
Corporate bonds		39,714		45		(9	)		39,750
Total marketable securities	$	52,645	$	60	$	(9	)	$	52,696

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

The following table summarizes available-for-sale securities in an unrealized loss position for which an allowance for credit losses has not been recorded at June 30, 2020 and December 31, 2019, aggregated by major security type and length of time in a continuous unrealized loss position:

	June 30, 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	$	24,987	$	(4	)	$	—	$	—	$	24,987	$	(4	)
Corporate bonds		5,001		(1	)		—		—		5,001		(1	)
Total	$	29,988	$	(5	)	$	—	$	—	$	29,988	$	(5	)

	December 31, 2019
	Less Than 12 Months					12 Months or Longer				Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Corporate bonds	$	13,022	$	(9	)	$	—	$	—	$	13,022	$	(9	)

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):

	June 30,		December 31,
	2020		2019
Due in one year or less	$	92,017	$	49,687
Due in 1 - 2 years		—		3,009
Total marketable securities	$	92,017	$	52,696