Cash Equivalents and Investments - (Tables)

9 Months Ended

Sep. 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 September 30, 2019 and December 31, 2018:

	September 30, 2019
			Gross Unrealized
(In thousands)	Amortized Cost		Gains		Losses		Fair Value
Money market funds	$	19,431	$	—	$	—	$	19,431
Commercial paper	13,018		—		—		13,018
Corporate notes	13,549		19		—		13,568
U.S. government securities	6,986		6		—		6,992
U.S. asset-backed securities	4,178		4		—		4,182
	$	57,162	$	29	$	—	$	57,191
Classified as:
Cash equivalents							$	19,431
Short-term investments							37,760
							$	57,191

	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