Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]

Schedule of Composition of Marketable Securities

The following table summarizes the composition of our Short-term marketable securities at fair value: 

(In thousands)	September 30, 2017		December 31, 2016
Short-term marketable securities:
Corporate and government bonds and notes, and commercial paper	$	7,982	$	10,230
Certificates of deposit	—		78
Total marketable securities	$	7,982	$	10,308