Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of activity in asset retirement obligations

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

	2018		2017
Balance, beginning	$	184	$	178
Accretion of liability due to passage of time		14		6
Amortization of asset due to passage of time		—		—
Balance, ending	$	198	$	184