Nature of operations and summary of significant accounting policies (Tables)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Components of accounts receivable

Accounts receivable consisted of the following:

	September 30, 2019			December 31, 2018
Joint interests	$	18,605		$	31,573
Accrued commodity sales	23,408			30,287
Derivative settlements	2,820			2,092
Other	1,412			3,375
Allowance for doubtful accounts	(1,100		)	(1,240		)
	$	45,145		$	66,087

Components of inventories

Inventories consisted of the following:

	September 30, 2019			December 31, 2018
Equipment inventory	$	3,573		$	3,663
Commodities	521			574
Inventory valuation allowance	(179		)	(178		)
	$	3,915		$	4,059

Summary of property and equipment, net

Major classes of property and equipment are shown in the following table:

	September 30, 2019		December 31, 2018
Machinery and equipment	$	7,249	$	21,482
Office and computer equipment	6,951		6,183
Automobiles and trucks	4,911		3,548
Building and improvements	1,899		18,693
Furniture and fixtures	8		520
	21,018		50,426
Less accumulated depreciation, amortization and impairment	9,271		12,449
	11,747		37,977
Land	2,518		5,119
	$	14,265	$	43,096

Components of unevaluated oil and natural gas properties

The costs of unevaluated oil and natural gas properties consisted of the following:

	September 30, 2019		December 31, 2018
Leasehold acreage	$	338,892	$	427,206
Capitalized interest	15,469		11,377
Wells and facilities in progress of completion	19,400		28,033
Total unevaluated oil and natural gas properties excluded from amortization	$	373,761	$	466,616

Summary of disaggregation of revenue

The following table displays the revenue disaggregated and reconciles the disaggregated revenue to the revenue reported:

	Three months ended September 30,						Nine months ended September 30,
	2019			2018			2019			2018
Revenues:
Oil	$	40,459		$	46,576		$	124,251		$	132,378
Natural gas	8,745			9,458			30,427			26,584
Natural gas liquids	8,801			14,078			29,043			34,789
Gross commodity sales	58,005			70,112			183,721			193,751
Transportation and processing	(6,167		)	(4,593		)	(16,557		)	(11,916		)
Net commodity sales	$	51,838		$	65,519		$	167,164		$	181,835

Schedule of other expense

Other expense consisted of the following:

	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Restructuring	$	—	$	—	$	—	$	425
Subleases	269		402		1,075		1,208
Total other expense	$	269	$	402	$	1,075	$	1,633

Schedule of reorganization items

Reorganization items are as follows:

	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Loss on the settlement of liabilities subject to compromise	$	—	$	—	$	—	$	48
Professional fees	530		493		1,306		1,962
Total reorganization items	$	530	$	493	$	1,306	$	2,010