Accounts Receivable and Revenues from Contracts with Customers - Additional Information (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) Customer	Sep. 30, 2019 USD ($) Customer	Dec. 31, 2019 USD ($)	Jan. 01, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained earnings	$ 144,877		$ 319,987
Accounts Receivable, Allowance for Credit Loss	154		52
Accounts Receivable, Credit Loss Expense (Reversal)	26
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 0
Name of Major Customer [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commodity Products, Number of Customers | Customer	20
Financing Receivable, Credit Risk Percentage	0.00%
Accounts Receivable, Allowance for Credit Loss	$ 0		0
Accounts Receivable, Credit Loss Expense (Reversal)	0
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 0
Joint Interest Partners, Mutual Operators [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commodity Products, Number of Customers | Customer	3
Financing Receivable, Credit Risk Percentage	5.00%			0.00%
Accounts Receivable, Allowance for Credit Loss	$ 5		0
Accounts Receivable, Credit Loss Expense (Reversal)	5
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 0
Joint Interest Partners, Large Partners [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commodity Products, Number of Customers | Customer	4
Financing Receivable, Credit Risk Percentage	2.00%			1.00%
Accounts Receivable, Allowance for Credit Loss	$ 67		0
Accounts Receivable, Credit Loss Expense (Reversal)	7
Accounts Receivable, Allowance for Credit Loss, Writeoff	$ 0
Joint Interest Partners, All Others [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commodity Products, Number of Customers | Customer	30
Financing Receivable, Credit Risk Percentage	10.00%			5.00%
Financing Receivable, Past Due	$ 200
Accounts Receivable, Allowance for Credit Loss	82		$ 52
Accounts Receivable, Credit Loss Expense (Reversal)	14
Accounts Receivable, Allowance for Credit Loss, Writeoff	0
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Allowance for Credit Loss				$ 76
Cumulative Effect, Period of Adoption, Adjustment [Member] | Name of Major Customer [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Allowance for Credit Loss				0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Joint Interest Partners, Mutual Operators [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Allowance for Credit Loss				0
Cumulative Effect, Period of Adoption, Adjustment [Member] | Joint Interest Partners, Large Partners [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Allowance for Credit Loss				60
Cumulative Effect, Period of Adoption, Adjustment [Member] | Joint Interest Partners, All Others [Domain]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Allowance for Credit Loss				$ 16
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained earnings	$ 100
Accounts Receivable | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	73.00%		55.00%
Accounts receivable, major customers	$ 17,900		$ 34,600
Accounts Receivable | Customer Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major customers | Customer	3	4
Revenues, major customers	$ (113,400)	$ (261,400)
Concentration risk, percentage	56.00%	76.00%
Accounts Receivable | Customer Concentration Risk [Member] | Major Customer 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ (46,000)
Concentration risk, percentage	23.00%
Accounts Receivable | Customer Concentration Risk [Member] | Major Customer 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ (40,400)
Concentration risk, percentage	20.00%
Accounts Receivable | Customer Concentration Risk [Member] | Major Customer 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ (27,000)
Concentration risk, percentage	13.00%