Cash Equivalents and Investments - (Tables)

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of fair value of securities, not including cash

The following tables summarize the gross unrealized gains and losses of the Company’s marketable securities as of June 30, 2019 and December 31, 2018:

	June 30, 2019
			Gross Unrealized
(In thousands)	Amortized Cost		Gains		Losses		Fair Value
Money market funds	$	4,831	$	—	$	—	$	4,831
Commercial paper	17,149		—		—		17,149
Corporate notes	17,225		20		—		17,245
U.S. government securities	6,955		11		—		6,966
U.S. asset-backed securities	10,680		7		—		10,687
	$	56,840	$	38	$	—	$	56,878
Classified as:
Cash equivalents							$	4,831
Short-term investments							52,047
							$	56,878

	December 31, 2018
			Gross Unrealized
(In thousands)	Amortized Cost		Gains		Losses			Fair Value
Money market funds	$	5,838	$	—	$	—		$	5,838
Repurchase agreements	5,000		—		—			5,000
Commercial paper	30,710		—		—			30,710
Corporate notes	13,168		—		(24		)	13,144
U.S. government securities	10,167		—		(1		)	10,166
U.S. asset-backed securities	10,632		—		(14		)	10,618
	$	75,515	$	—	$	(39	)	$	75,476
Classified as:
Cash equivalents								$	10,838
Short-term investments								64,638
								$	75,476