Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2018

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities

The Company’s marketable securities consisted of the following:

	September 30, 2018
	Amortized Cost Basis			Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Marketable securities:
Short-term
Money market accounts	$	4,726		$	—	$	—		$	4,726
Commercial paper		899			—		—			899
Corporate debt securities		23,291			2		(78	)		23,215
Less: cash equivalents		(4,726	)		—		—			(4,726	)
Total short-term marketable securities		24,190			2		(78	)		24,114
Corporate debt securities		4,295			—		(45	)		4,250
Total long-term marketable securities		4,295			—		(45	)		4,250
Total marketable securities	$	28,485		$	2	$	(123	)	$	28,364

	December 31, 2017
	Amortized Cost Basis			Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Marketable securities:
Short-term
Money market accounts	$	723		$	—	$	—		$	723
Corporate debt securities		20,040			2		(48	)		19,994
Less: cash equivalents		(723	)		—		—			(723	)
Total short-term marketable securities		20,040			2		(48	)		19,994
Corporate debt securities		14,999			—		(116	)		14,883
Total long-term marketable securities		14,999			—		(116	)		14,883
Total marketable securities	$	35,039		$	2	$	(164	)	$	34,877