Short-term Investments (Tables)

12 Months Ended

Dec. 31, 2016

Short-term Investments [Abstract]

Short-term Investments

Short-term marketable securities for the periods presented were comprised of the following (in thousands):

	December 31, 2016
Security Type	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
U.S. government fixed income securities	$	19,403	$	40	$	—	$	19,443