The cash outflow to purchase long lived physical asset for use in the normal oil and gas operations and to purchase mineral interests in oil and gas properties not intended for resale.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

Name:	us-gaap_PaymentsToAcquireOilAndGasPropertyAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Enduro Purchase and Sale Agreement - Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended
	May 15, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Asset Acquisition [Line Items]
Enduro transaction breakup fee		$ 0	$ 0	$ 1,100,000	$ 0
Affiliate of Enduro Resource Partners LLC
Asset Acquisition [Line Items]
Purchase price of oil and gas assets	$ 27,500,000
Escrow deposit	2,750,000
Enduro transaction breakup fee	$ 1,100,000