Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Assets measured at fair value on recurring basis

Assets measured at fair value on a recurring basis are summarized below (in thousands).

	Level 1		Level 2		Level 3		Total September 30, 2017
Marketable Securities (equity securities)	$	3,787	$	—	$	—	$	3,787

	Level 1		Level 2		Level 3		Total December 31, 2016
Marketable Securities (equity securities)	$	2,770	$	—	$	—	$	2,770
U.S. Treasury securities (cash equivalents)	$	1,002	$	—	$	—	$	1,002