Derivative Instruments and Hedging Activities - Schedule of Commodity Derivative Contracts (Details)	6 Months Ended
Jun. 30, 2020 $ / bbl bbl Mcf	Mar. 31, 2020 $ / bbl
Oil WTI Swaps July - December 2020
Derivative [Line Items]
Total volume \| bbl	7,565
Weighted average price - swap	57.38
Weighted average price - floor	51.60
Weighted average price - ceiling	65.56
Oil - WTI Swaps January - December 2021
Derivative [Line Items]
Total volume \| bbl	7,000
Weighted average price - swap	50.40	41.00
Weighted average price - floor	40.95
Weighted average price - ceiling	56.50
Natural Gas - Henry Hub Swaps July - December 2020
Derivative [Line Items]
Total volume \| bbl	20,000
Weighted average price - swap	2.55
Weighted average price - floor	2.38
Weighted average price - ceiling	2.80
Natural Gas - Henry Hub Swaps January- December 2021
Derivative [Line Items]
Total volume \| Mcf	27,500
Weighted average price - swap	2.36
Weighted average price - floor	2.32
Weighted average price - ceiling	2.39

- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageCapPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
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_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Details

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- Details

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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lone_NaturalGasHenryHubSwapsJulyToDecemberTwoThousandTwentyMember
Namespace Prefix:
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- Details

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