Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Change in Asset Retirement Obligation Account Activity

Activity in the asset retirement obligation account for the years ended December 31, is as follows:

	2014		2013
Balance, beginning	$	160	$	154
Accretion of liability due to passage of time		6		6
Amortization of asset due to passage of time		—		—
Balance, ending	$	166	$	160