Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Restrictions on Cash and Cash Equivalents

The December 31, 2018 accompanying statement of cash flow that was adjusted as a result of adoption of ASU 2016-18 is summarized below:

	Years Ended December 31,
	2018			2018
(In thousands)	As reported			As adjusted
Changes in restricted cash held in escrow for acquisitions	$	(474	)	$	—
Net cash provided by (used in) investing activities	(195,742		)	(195,268		)
Increase in cash, cash equivalents and restricted cash	$	25,099		$	25,573
Cash, cash equivalents and restricted cash, beginning of period	6,886			6,886
Cash, cash equivalents and restricted cash end of period	31,985			32,459

Schedule of Accounts Receivable

At December 31, 2019 and 2018, accounts receivable was comprised of the following:

	December 31,
(In thousands)	2019			2018
Oil and gas sales	$	27,888		$	19,769
Allowance for doubtful accounts	(556		)	(382		)
Other	2,959			1,308
Total accounts receivables	$	30,291		$	20,695

Schedules of Concentration of Risk, by Risk Factor

Concentrations of oil and gas sales to significant customers (operators) are presented in the table below.

	For the year ended December 31,
	2019		2018		2017
Occidental Petroleum Corp.	16	%	15	%	—
Continental Resources, Inc.	12	%	10	%	10	%
XTO Energy, Inc.	10	%	—		—
Noble Energy, Inc.	5	%	9	%	13	%