Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Commitments And Contingencies Disclosure [Abstract]

Summary of Activity for ARO Liabilities

The following table presents the activity for our ARO liabilities:

	ARO Liability (in thousands)
Balance as of December 31, 2017	$	580
Liabilities incurred during the period		88
Accretion expense		32
Balance as of September 30, 2018	$	700