Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on a Recurring Basis [Line Items]
Equity securities	$ 56	$ 60
U.S. Treasury securities (cash equivalents)	4,089	4,089
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets Measured on a Recurring Basis [Line Items]
Equity securities	56	60
U.S. Treasury securities (cash equivalents)	4,089	4,089
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on a Recurring Basis [Line Items]
Equity securities	0	0
U.S. Treasury securities (cash equivalents)	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on a Recurring Basis [Line Items]
Equity securities	0	0
U.S. Treasury securities (cash equivalents)	$ 0	$ 0