Cash Equivalents and Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2019

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, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents
Money market funds	$	5,947	$	—	$	—		$	5,947
Reverse repurchase agreements		6,250		—		—			6,250
Commercial paper		7,991		—		(1	)		7,990
Total cash equivalents		20,188		—		(1	)		20,187
Marketable securities
Commercial paper		41,407		39		(1	)		41,445
U.S. government securities		38,636		43		(13	)		38,666
Total marketable securities	$	80,043	$	82	$	(14	)	$	80,111

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents
Money market funds	$	7,180	$	—	$	—		$	7,180
Reverse repurchase agreements		6,250		—		—			6,250
Commercial paper		5,977		—		(1	)		5,976
Total cash equivalents		19,407		—		(1	)		19,406
Marketable securities
Commercial paper		47,964		—		(24	)		47,940
U.S. government securities		4,114		—		(2	)		4,112
Total marketable securities	$	52,078	$	—	$	(26	)	$	52,052

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,
	2019		2018
Due in one year or less	$	67,330	$	52,052
Due in 1 - 2 years		12,781		—
Total marketable securities	$	80,111	$	52,052