Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Equity securities [Member]
Assets measured at fair value on recurring basis [Abstract]
Fair value assets	$ 54	$ 60
U.S. Treasury securities [Member]
Assets measured at fair value on recurring basis [Abstract]
Fair value assets	4,089	4,089
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
Assets measured at fair value on recurring basis [Abstract]
Fair value assets	54	60
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury securities [Member]
Assets measured at fair value on recurring basis [Abstract]
Fair value assets	4,089	4,089
Significant Other Observable Inputs (Level 2) [Member] | Equity securities [Member]
Assets measured at fair value on recurring basis [Abstract]
Fair value assets	0	0
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury securities [Member]
Assets measured at fair value on recurring basis [Abstract]
Fair value assets	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities [Member]
Assets measured at fair value on recurring basis [Abstract]
Fair value assets	0	0
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury securities [Member]
Assets measured at fair value on recurring basis [Abstract]
Fair value assets	$ 0	$ 0