Supplemental Disclosures of Cash Flow Information

12 Months Ended

Dec. 31, 2021

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures of Cash Flow Information

Supplemental Disclosures of Cash Flow informationSupplemental disclosures regarding cash flow information and non-cash investing and financing activities are as follows:

	Year Ended December 31,
	2021		2020		2019
Cash paid for interest	$	1,548	$	1,766	$	2,833
Cash paid for taxes	$	209	$	635	$	207
Non-cash investing activities:
Asset retirement obligation	$	—	$	34	$	(5,114)
Non-cash financing activities:
Equipment purchased with debt	$	—	$	—	$	4,733
Write-off of remaining balance of returned equipment under capital lease	$	—	$	—	$	398
Capitalized expenditures in accounts payable and accrued expenses	$	1,586	$	376	$	899