Cash Equivalents and Marketable Securities (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Cash equivalents
Money market funds	$	14,613	$	—	$	—		$	14,613
Reverse repurchase agreements		6,250		—		—			6,250
Commercial paper		5,980		—		—			5,980
Total cash equivalents		26,843		—		—			26,843
Marketable securities
Commercial paper		36,938		15		(2	)		36,951
U.S. government securities		1,119		—		—			1,119
Total marketable securities	$	38,057	$	15	$	(2	)	$	38,070

	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