Debt covenant current ratio.

No definition available.

Name:	lone_DebtCovenantCurrentRatio
Namespace Prefix:	lone_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Covenant, Maximum Debt EBITDAX Ratio

+ References

No definition available.

+ Details

Name:	lone_DebtCovenantMaximumDebtEBITDAXRatio
Namespace Prefix:	lone_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument expanded borrowing base.

+ References

No definition available.

+ Details

Name:	lone_DebtInstrumentExpandedBorrowingBase
Namespace Prefix:	lone_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Letter of credit facility sub limit.

+ References

No definition available.

+ Details

Name:	lone_LetterOfCreditFacilitySubLimit
Namespace Prefix:	lone_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line Of Credit Facility, Excess Outstanding Balance Over Borrowing Maximum

+ References

No definition available.

+ Details

Name:	lone_LineOfCreditFacilityExcessOutstandingBalanceOverBorrowingMaximum
Namespace Prefix:	lone_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of assets secured under credit facility.

+ References

No definition available.

+ Details

Name:	lone_PercentageOfAssetsSecuredUnderCreditFacility
Namespace Prefix:	lone_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600

+ Details

Name:	us-gaap_LongTermLineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=lone_SeniorSecuredCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=lone_LonestarResourcesAmericaIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=lone_CitibankNaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=lone_FederalFundsEffectiveRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=lone_AlternateBaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt - Senior Secured Credit Facility - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended	9 Months Ended
	Jun. 11, 2020	Jul. 28, 2015	Jul. 31, 2015	Mar. 31, 2019	Sep. 30, 2020	Jul. 02, 2020	Jul. 01, 2020	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Senior Secured Credit Facility					$ 285,000,000				$ 247,000,000
Maximum debt EBITDAX ratio					4.0
Current ratio					100.00%
Senior Secured Credit Facility
Debt Instrument [Line Items]
Senior Secured Credit Facility					$ 285,000,000	$ 285,000,000
Senior secured credit facility sub limit					2,500,000
Debt instrument expanded borrowing base	$ 286,000,000					225,000,000	$ 286,000,000	$ 290,000,000
Borrowing deficiency					$ 60,400,000	$ 60,400,000
Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage					0.375%
Senior Secured Credit Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%				0.50%
Letter of Credit \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument borrowing base									$ 400,000
LRAI \| Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Percentage of assets secured under credit facility	100.00%			80.00%
LRAI \| Citibank N A \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument face amount			$ 500,000,000
Senior Secured Credit Facility					$ 285,000,000.0
Debt, weighted average interest rate					4.98%
Debt instrument borrowing base					$ 600,000
Federal Funds Effective Rate \| LRAI \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Variable rate		0.50%
LIBOR \| Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Variable rate	3.00%		2.00%
LIBOR \| Senior Secured Credit Facility \| Maximum
Debt Instrument [Line Items]
Variable rate	4.50%		3.00%
LIBOR \| LRAI \| Senior Secured Credit Facility
Debt Instrument [Line Items]
Variable rate		1.00%
Alternate Base Rate \| Senior Secured Credit Facility \| Minimum
Debt Instrument [Line Items]
Variable rate	2.00%		1.00%
Alternate Base Rate \| Senior Secured Credit Facility \| Maximum
Debt Instrument [Line Items]
Variable rate	3.50%		2.00%