Cash Equivalents and Investments (Tables)

9 Months Ended

Sep. 30, 2018

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 September 30, 2018:

	September 30, 2018
			Gross Unrealized
(In thousands)	Amortized Cost		Gains		Losses			Fair Value
Money market funds	$	18,684	$	—	$	—		$	18,684
Repurchase agreements	10,002		—		—			10,002
Commercial paper	21,832		—		—			21,832
Corporate notes	13,058		—		(11		)	13,047
U.S. government securities	3,174		—		(1		)	3,173
U.S. asset-backed securities	8,430		—		(6		)	8,424
	$	75,180	$	—	$	(18	)	$	75,162
Classified as:
Cash equivalents								$	30,700
Short-term investments								44,462
								$	75,162