Lonestar Resources US (LONE) 10-Q/A 2 Nov 18 2018 Q2 Quarterly report (amended) Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 02, 2018
Document And Entity Information [Abstract]
Document Type	10-Q/A
Amendment Flag	true
Amendment Description	This Amendment No. 1 on Form 10-Q/A (this “Form 10-Q/A") amends and restates certain items noted below in the Quarterly Report on Form 10-Q of Lonestar Resources US Inc. (the “Company”) for the quarter ended June 30, 2018, as originally filed with the Securities and Exchange Commission on May 14, 2018 (the “Original Filing”). This Form 10-Q/A amends the Original Filing to reflect the correction of an error in the previously-reported unaudited condensed consolidated financial statements related to the Company’s depreciation, depletion and amortization (“DD&A”) expense calculation. See Note 2 to the Condensed Consolidated Financial Statements included in Item 1 for additional information and a reconciliation of the previously reported amounts to the restated amounts.
Document Period End Date	Jun. 30, 2018
Trading Symbol	LONE
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Entity Registrant Name	Lonestar Resources US Inc.
Entity Central Index Key	1,661,920
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Small Business	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		24,637,127

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 5,460	$ 2,538
Accounts receivable
Oil, natural gas liquid and natural gas sales	12,041	12,289
Joint interest owners and others, net	1,396	794
Related parties	62	162
Derivative financial instruments	145	472
Prepaid expenses and other	1,653	2,365
Total current assets	20,757	18,620
Oil and gas properties, using the successful efforts method of accounting
Proved properties	834,493	750,226
Unproved properties	76,619	78,655
Other property and equipment	16,817	15,763
Less accumulated depreciation, depletion and amortization	(310,176)	(274,374)
Net property and equipment	617,753	570,270
Deferred tax assets, net	1,662	0
Other non-current assets	2,086	2,918
Total assets	642,258	591,808
Current liabilities
Accounts payable	32,086	25,901
Accounts payable -- related parties	270	389
Oil, natural gas liquid and natural gas sales payable	11,254	8,747
Accrued liabilities	31,518	16,583
Derivative financial instruments	27,570	12,336
Total current liabilities	102,698	63,956
Long-term liabilities
Long-term debt	337,264	301,155
Asset retirement obligations	5,918	5,649
Deferred tax liabilities, net	0	4,769
Equity warrant liability	1,404	508
Equity warrant liability -- related parties	2,682	963
Derivative financial instruments	22,186	9,802
Other non-current liabilities	4,948	1,316
Total long-term liabilities	374,402	324,162
Commitments and contingencies (Note 12)
Stockholders' Equity
Series A-1 convertible participating preferred stock, $0.001 par value, 87,789 and 83,968 shares issued and outstanding, respectively	0	0
Additional paid-in capital	174,469	174,871
Accumulated deficit	(151,966)	(113,836)
Total stockholders' equity	165,158	203,690
Total liabilities and stockholders' equity	642,258	591,808
Class A Voting Common Stock
Stockholders' Equity
Common stock	142,655	142,655
Total stockholders' equity	142,655	142,655
Class B Non-Voting Common Stock
Stockholders' Equity
Common stock	$ 0	$ 0

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Class A Voting Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	24,637,127	24,506,647
Common stock, shares outstanding	24,637,127	24,506,647
Class B Non-Voting Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	5,000	5,000
Common stock, shares issued	2,500	2,500
Common stock, shares outstanding	2,500	2,500
Series A-1 Convertible Participating Preferred Stock
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares issued	87,789	83,968
Preferred stock, shares outstanding	87,789	83,968

Consolidated Statements Of Oper

Consolidated Statements Of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Revenues	$ 47,852	$ 18,135	$ 84,544	$ 35,751
Expenses
Lease operating and gas gathering	6,490	3,521	11,074	6,477
Production and ad valorem taxes	2,761	1,077	4,927	2,114
Depreciation, depletion and amortization	20,737	13,498	36,162	25,472
Loss on sale of oil and gas properties	0	205	1,568	348
Impairment of oil and natural gas properties	0	27,081	0	27,081
Loss on sale of oil and gas properties	5,305	3,600	8,724	6,281
Acquisition costs and other	(3)	2,680	(13)	2,669
Total expenses	35,290	51,662	62,442	70,442
Income (loss) from operations	12,562	(33,527)	22,102	(34,691)
Other (expense) income
Interest expense	(9,298)	(8,819)	(18,555)	(13,851)
Unrealized (loss) gain on warrants	(2,462)	614	(2,615)	2,884
(Loss) gain on derivative financial instruments	(25,498)	5,416	(36,654)	14,162
Loss on extinguishment of debt	0	0	(8,619)	0
Total other (expense) income, net	(37,258)	(2,789)	(66,443)	3,195
Loss before income taxes	(24,696)	(36,316)	(44,341)	(31,496)
Income tax benefit	3,103	12,601	6,211	10,898
Net loss	(21,593)	(23,715)	(38,130)	(20,598)
Preferred stock dividends	(1,932)	(296)	(3,821)	(296)
Net loss attributable to common stockholders	$ (23,525)	$ (24,011)	$ (41,951)	$ (20,894)
Net loss per common share
Basic (in dollars per share)	$ (0.96)	$ (1.10)	$ (1.71)	$ (0.96)
Diluted (in dollars per share)	$ (0.96)	$ (1.10)	$ (1.71)	$ (0.96)
Weighted average common shares outstanding
Basic (in shares)	24,599,744	21,822,015	24,598,345	21,822,015
Diluted (in shares)	24,599,744	21,822,015	24,598,345	21,822,015
Warrant	$ (4,086)		$ (4,086)
Oil sales
Revenues
Revenues	39,707	$ 15,090	72,859	$ 29,580
Natural gas liquid sales
Revenues
Revenues	4,410	1,319	6,143	2,989
Natural gas sales
Revenues
Revenues	$ 3,735	$ 1,726	$ 5,542	$ 3,182

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Total	Class A Voting Common Stock	Series A-1 Preferred Stock	Additional Paid-in Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017		24,506,647	83,968
Beginning balance at Dec. 31, 2017	$ 203,690	$ 142,655		$ 174,871	$ (113,836)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			3,821
Issued pursuant to stock based compensation plan (in shares)		130,480
Issued pursuant to stock-based compensation plan	(601)			(601)
Stock-based compensation	199			199
Net loss	(38,130)				(38,130)
Ending balance at Jun. 30, 2018	$ 165,158	$ 142,655		$ 174,469	$ (151,966)
Ending balance (in shares) at Jun. 30, 2018		24,637,127	87,789

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net loss	$ (38,130)	$ (20,598)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	36,162	25,472
Stock-based compensation	2,713	639
Share based payments	(601)	0
Deferred taxes	(6,432)	(11,262)
Loss (gain) on derivative financial instruments	36,620	(14,162)
Settlements of derivative financial instruments	(8,676)	2,682
Impairment of oil and natural gas properties	0	27,081
Loss on abandoned property and equipment	170	0
Non-cash interest expense	3,544	3,434
Unrealized loss (gain) on warrants	2,615	(2,884)
Changes in operating assets and liabilities:
Accounts receivable	(254)	(1,308)
Prepaid expenses and other assets	(1,159)	(3,010)
Accounts payable and accrued expenses	12,179	11,028
Net cash provided by operating activities	38,751	17,112
Cash flows from investing activities
Acquisition of oil and gas properties	(2,862)	(108,179)
Development of oil and gas properties	(66,761)	(37,750)
Purchases of other property and equipment	(1,498)	(1,522)
Net cash used in investing activities	(71,121)	(147,451)
Cash flows from financing activities
Proceeds from borrowings and related party borrowings	290,744	76,079
Payments on borrowings and related party borrowings	(255,452)	(19,503)
Proceeds from the sale of preferred stock	0	77,800
Cost to issue equity	0	(1,000)
Payments of debt issuance costs	0	(2,537)
Net cash provided by financing activities	35,292	130,839
Net increase in cash and cash equivalents	2,922	500
Cash and cash equivalents, beginning of the period	2,538	6,068
Cash and cash equivalents, end of the period	5,460	6,568
Supplemental information:
Cash paid for taxes	1,147	2,240
Cash paid for interest	6,143	10,674
Non-cash investing and financing activities:
Preferred stock issued for asset acquisition	0	10,795
Cost to issue equity included in accounts payable	0	1,500
Asset retirement obligation	183	2,235
Increase in liabilities for capital expenditures	$ 12,425	$ 1,358

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Organization and Nature of Operations Lonestar Resources US Inc. (“Lonestar”) is an independent oil and natural gas company focused on the development, production and acquisition of unconventional oil, natural gas liquids (“NGLs”) and natural gas properties in the Eagle Ford shale play in South Texas, primarily through our subsidiary, Lonestar Resources, Inc. Lonestar is a Delaware corporation with our common stock listed and traded on the Nasdaq Global Select Market under the symbol “LONE”. Interim Financial Statements The accompanying unaudited condensed consolidated financial statements of Lonestar Resources US Inc., and its subsidiaries have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) and do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These financial statements and the notes thereto should be read in conjunction with our Annual Report on Form 10-K/A for the year ended December 31, 2017 (the “Form 10-K/A”). Unless indicated otherwise or the context requires, the terms “we,” “our,” “us,” “Company” or “Lonestar,” refer to Lonestar Resources US Inc. and its subsidiaries. Accounting measurements at interim dates inherently involve greater reliance on estimates than at year end, and the results of operations for the interim periods shown in this report are not necessarily indicative of results to be expected for the year. In management’s opinion, the accompanying unaudited condensed consolidated financial statements include all adjustments of a normal recurring nature necessary for a fair statement of our consolidated financial position as of June 30, 2018 , our consolidated results of operations for the three and six months ended June 30, 2018 and 2017 , and our consolidated cash flows for the six months ended June 30, 2018 and 2017 . Reclassifications Certain prior period amounts have been reclassified to conform to the current year presentation. Such reclassifications had no impact on our reported net loss, current assets, current liabilities, total liabilities or stockholders’ equity. Net Loss per Common Share Basic net loss per common share is computed by dividing the net loss attributable to common stockholders by the weighted average number of common stock outstanding during the period. Diluted net loss per common share is calculated in the same manner but includes the impact of potentially dilutive securities. Potentially dilutive securities consist of warrants, equity compensation awards and preferred equity shares under the as-converted method. The following table is a reconciliation of the weighted average shares used in the basic and diluted net loss per common share calculations for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Basic weighted average common shares outstanding 24,599,744 21,822,015 24,598,345 21,822,015 Potentially dilutive securities Warrants — — — — Restricted stock units — — — — Diluted weighted average common shares outstanding 24,599,744 21,822,015 24,598,345 21,822,015 Basic weighted average common shares exclude shares of non-vested restricted stock. As these restricted shares vest, they will be included in the shares outstanding used to calculate basic net loss per common share. The following securities could potentially dilute earnings per share in the future, but were excluded from the computation of diluted net loss per share, as their effect would have been antidilutive: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Preferred stock 14,313,038 2,490,842 14,156,471 1,252,302 Warrants 760,000 760,000 760,000 760,000 Stock appreciation rights 999,643 682,500 841,948 487,956 Restricted stock units 1,002,072 602,000 726,919 432,796 Recent Accounting Pronouncements Leases. In February 2016, the FASB issued ASU 2016-02, Leases (“ASU 2016-02”), which will require organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. Additional qualitative and quantitative disclosures will also be required. ASU 2016-02 is effective for the annual period beginning after December 15, 2018, including interim periods within those fiscal years, and early adoption is permitted. Currently, entities must adopt the standard using a modified retrospective transition and apply the guidance to the earliest comparative period presented, with certain practical expedients that entities may elect to apply. Changes to processes and internal controls to meet the standard’s reporting and disclosure requirements have been identified and are being implemented. In addition to lease agreements, service contracts and other agreements are also being reviewed to determine if they contain an embedded lease. The Company continues to evaluate the expected impact of this standard update on disclosures, but does not anticipate any material changes to operating results or liquidity as a result of right-of-use assets and corresponding lease liabilities that will be recorded. Revenue Recognition. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which created Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with Customers (“ASC 606”). The objective of ASU 2014-09 is greater consistency and comparability across industries by using a five-step model to recognize revenue from customer contracts. Effective January 1, 2018, the Company adopted ASU 2014-09, using the modified retrospective method applied to contracts that were not completed as of January 1, 2018. Under the modified retrospective method, the Company recognizes the cumulative effect of initially applying ASU 2014-09 as an adjustment to the opening balance of accumulated deficit; however, no significant adjustment was required as a result of adopting the new standard. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606. The comparative information has not been restated and continues to be reported under historic accounting standards in effect for those periods. The impact of the adoption of ASU 2014-09 is expected to be immaterial to the Company’s net income on an ongoing basis. See Note 5. Revenue Recognition, for further discussion.

Restatement of Previously Issue

Restatement of Previously Issued Financial Statements	6 Months Ended
	Jun. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Restatement of Previously Issued Financial Statements	Restatement of Previously Issued Financial Statements As previously disclosed, we determined that instead of using updated oil and natural gas reserve estimates to calculate depreciation, depletion and amortization (“DD&A”) expense calculations looking back to the beginning of the applicable fiscal year, we instead should have used the updated oil and natural gas reserve estimates to calculate DD&A looking back to the beginning of the applicable current quarter. This methodology resulted in the understatement of DD&A expense and the overstatement of oil and gas properties, as well as the related income tax effects. We concluded that the impact of applying the correct oil and natural gas reserve revision methodology to the DD&A calculation was materially different from our previously reported results under our historical practice. As a result, we are restating our condensed consolidated financial statements for the periods impacted. The table below sets forth the condensed consolidated statements of operations, including the balances originally reported, corrections and the as restated balances for each period: Three Months Ended June 30, 2018 June 30, 2017 (In thousands except per share data) As Previously Reported Correction As Restated As Previously Reported Correction As Restated Depreciation, depletion and amortization $ 19,464 $ 1,273 $ 20,737 $ 12,551 $ 947 $ 13,498 Total expenses 34,017 1,273 35,290 50,715 947 51,662 Income (loss) from operations 13,835 (1,273 ) 12,562 (32,580 ) (947 ) (33,527 ) Loss before income taxes (23,423 ) (1,273 ) (24,696 ) (35,369 ) (947 ) (36,316 ) Income tax benefit (expense) 4,648 (1,545 ) 3,103 12,208 393 12,601 Net loss attributable to common stockholders (20,707 ) (2,818 ) (23,525 ) (23,457 ) (554 ) (24,011 ) Net loss per common share: Basic $ (0.84 ) $ (0.12 ) $ (0.96 ) $ (1.07 ) $ (0.03 ) $ (1.10 ) Diluted $ (0.84 ) $ (0.12 ) $ (0.96 ) $ (1.07 ) $ (0.03 ) $ (1.10 ) Six Months Ended June 30, 2018 June 30, 2017 (In thousands except per share data) As Previously Reported Correction As Restated As Previously Reported Correction As Restated Depreciation, depletion and amortization $ 35,027 $ 1,135 $ 36,162 $ 24,693 $ 779 $ 25,472 Total expenses 61,307 1,135 62,442 69,663 779 70,442 Income (loss) from operations 23,237 (1,135 ) 22,102 (33,912 ) (779 ) (34,691 ) Loss before income taxes (43,206 ) (1,135 ) (44,341 ) (30,717 ) (779 ) (31,496 ) Income tax benefit (expense) 7,778 (1,567 ) 6,211 10,621 277 10,898 Net loss attributable to common stockholders (39,249 ) (2,702 ) (41,951 ) (20,392 ) (502 ) (20,894 ) Net loss per common share Basic $ (1.60 ) $ (0.11 ) $ (1.71 ) $ (0.93 ) $ (0.03 ) $ (0.96 ) Diluted $ (1.60 ) $ (0.11 ) $ (1.71 ) $ (0.93 ) $ (0.03 ) $ (0.96 ) The table below sets forth the condensed consolidated balance sheet, including the balances originally reported, corrections and the as restated balances for the restated period: June 30, 2018 (In thousands) As Previously Reported Correction As Restated Assets Accumulated depreciation, depletion and amortization $ (294,049 ) $ (16,127 ) (310,176 ) Net property and equipment 633,880 (16,127 ) 617,753 Deferred tax assets, net — 1,662 1,662 Total assets 656,723 (14,465 ) 642,258 Liabilities and Stockholders' equity Deferred tax liabilities, net 106 (106 ) — Total long-term liabilities 374,508 (106 ) 374,402 Accumulated deficit (137,608 ) (14,358 ) (151,966 ) Total stockholders' equity 179,516 (14,358 ) 165,158 The table below sets forth the condensed consolidated statements of cash flows from operating activities, including the balances originally reported, corrections and the as restated balances for each period: Six Months Ended June 30, 2018 June 30, 2017 (In thousands) As Previously Reported Correction As Restated As Previously Reported Correction As Restated Cash flows from operating activities: Net (loss) income (35,428 ) (2,702 ) (38,130 ) $ (20,096 ) $ (502 ) $ (20,598 ) Depreciation, depletion and amortization 35,027 1,135 36,162 24,693 779 25,472 Deferred taxes (7,999 ) 1,567 (6,432 ) (10,985 ) (277 ) (11,262 ) Net cash provided by operating activities 38,751 — 38,751 17,112 — 17,112 The restatement had no impact on cash flows from investing activities or financing activities. The table below sets forth the condensed consolidated statement of stockholders’ equity, including the balances originally reported, corrections and the as restated balances for the period: Total Accumulated Stockholders' (In thousands) Deficit Equity Balance at June 30, 2018, as previously reported $ (137,608 ) $ 179,516 Correction (14,358 ) (14,358 ) Balance at June 30, 2018, as restated (151,966 ) 165,158 In addition to the restated consolidated financial statements, the information contained in Note 3 has been restated.

Acquisitions and Divestitures

Acquisitions and Divestitures	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures New Corporate Headquarters On August 2, 2017, the Company closed on the purchase of an office building in Fort Worth, Texas, with an acquisition price approximating $10 million , to which the Company relocated its corporate operations in February 2018. In light of the relocation, the Company recorded an impairment charge of $1.6 million in Other Expense on the Unaudited Condensed Consolidated Statement of Operations during the first quarter of 2018, primarily reflecting the remaining future minimum rentals of the lease for the Company’s prior corporate office from the date of relocation to the end of the remaining lease term. Battlecat Acquisition On June 15, 2017, the Company closed an acquisition with Battlecat Oil & Gas, LLC (“Battlecat”) whereby the Company acquired oil and gas properties in the Eagle Ford Shale play in DeWitt, Gonzales and Karnes County, Texas (the “Battlecat Acquisition”). The total purchase consideration of approximately $59.8 million consisted of $55.0 million in cash and 1,184,632 shares of Series B Convertible Preferred Stock, par value $0.001 per share (“Series B Preferred Stock”) at a value of approximately $4.8 million . Allocation of the purchase consideration was as follows: $56.3 million to proved reserves; $2.9 million to unproved reserves and $0.6 million to unevaluated acreage and other assets. Additionally, the Company recorded an asset retirement obligation of approximately $0.2 million , resulting in fair value of net assets acquired of approximately $59.6 million . The Company accounted for the acquisition as a business combination under ASC 805. Acquisition-related costs of approximately $1.5 million were charged to Acquisition Costs in the Consolidated Statements of Operations. The effective date of the acquisition was April 1, 2017 . Marquis Acquisition On June 15, 2017, the Company closed an acquisition with SN Marquis LLC (a subsidiary of Sanchez Energy Corporation) (“Marquis”) whereby the Company acquired oil and gas properties in the Eagle Ford Shale play in Fayette, Gonzales and Lavaca County, Texas (the “Marquis Acquisition”). The total purchase consideration of approximately $50.0 million consisted of $44.0 million in cash and 1,500,000 shares of Series B Preferred Stock at a value of approximately $6.0 million . Allocation of the purchase price was as follows: $48.0 million to proved reserves; $0.6 to unproved reserves and $1.4 million to land, building and other assets. Additionally, the Company recorded an asset retirement obligation of approximately $1.9 million , resulting in fair value of net assets acquired of approximately $48.1 million . The Company accounted for the acquisition as a business combination under ASC 805. Acquisition-related costs of approximately $1.2 million were charged to Acquisition Costs in the Consolidated Statements of Operations. The effective date of the acquisition was January 1, 2017 .

Commodity Price Risk Activities

Commodity Price Risk Activities	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Commodity Price Risk Activities	Commodity Price Risk Activities The Company enters into certain commodity derivative instruments to mitigate commodity price risk associated with a portion of its future oil, NGL and natural gas production and related cash flows. The oil, NGL and natural gas revenues and cash flows are affected by changes in commodity product prices, which are volatile and cannot be accurately predicted. The objective for holding these commodity derivatives is to protect the operating revenues and cash flows related to a portion of the future oil, NGL and natural gas sales from the risk of significant declines in commodity prices, which helps ensure the Company’s ability to fund the capital budget. Inherent in the Company’s fixed price contracts, are certain business risks, including market risk and credit risk. Market risk is the risk that the price of oil and natural gas will change, either favorably or unfavorably, in response to changing market conditions. Credit risk is the risk of loss from non-performance by the Company’s counterparty to a contract. The Company does not currently require cash collateral from any of its counterparties nor does its counterparties require cash collateral from the Company. At June 30, 2018 , the Company had no open physical delivery obligations. The following table summarizes the Company’s commodity derivative contracts as of June 30, 2018 : Commodity Contract Type Period Volume Hedged (Bbls/MMBtu per day) Weighted Average Price Swap Floor Ceiling Oil -WTI Swaps July-December 2018 6,689 $ 56.45 — — Oil -WTI 2-Way Collar July-December 2018 500 — $ 50.00 $ 59.45 Oil -WTI Swaps January-December 2019 4,930 51.21 — — Oil -WTI Swaps January-December 2020 1,684 53.02 — — Natural Gas - Henry Hub Swaps July-December 2018 7,393 3.05 — — During July 2018, the Company entered into additional WTI swaps for 182,500 Bbls at a strike price of $65.20 per Bbl for the period of January through December 2019, and 183,000 Bbls at a strike price of $61.65 per Bbl for the period of January through December 2020. The Company has not designated any of the commodity derivatives as hedges under the applicable accounting standards. Consequently, all changes in fair value of these derivatives (realized and unrealized) are included in the Unaudited Condensed Consolidated Statements of Operations. As of June 30, 2018 , all of the Company’s economic derivative hedge positions were with large financial institutions, which are not known to the Company to be in default on their derivative positions. The Company is exposed to credit risk to the extent of non-performance by the counterparties in the derivative contracts discussed above; however, the Company does not anticipate non-performance by such counterparties. None of the Company’s derivative instruments contain credit-risk related contingent features.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2018
Disaggregation of Revenue [Abstract]
Revenue Recognition	Revenue Recognition Operating revenues are comprised of sales of crude oil, NGLs and natural gas. In thousands Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Oil $ 39,707 $ 15,090 $ 72,859 $ 29,580 NGLs 4,410 1,319 6,143 2,989 Natural gas 3,735 1,726 5,542 3,182 Total operating revenues $ 47,852 $ 18,135 $ 84,544 $ 35,751 Accounting Policies Revenue is recognized when performance obligations under the terms of a contract with a customer are satisfied. The Company recognizes revenue when control has been transferred to the customer, generally at the time commodities reach an agreed-upon delivery point. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring products and is generally based upon a negotiated formula, list or fixed price. Typically, the Company sells its products directly to customers generally under agreements with payment terms typically less than 30 days. Oil Revenues The Company’s crude oil sales contracts are generally structured such that Lonestar commits and dedicates for sale a specified volume of oil production from agreed-upon leases to a purchaser. Oil is sold at a contractually-specified index price plus or minus a differential, and title and control of the product generally transfers at the delivery point specified in the contract, at which point related revenue is recognized. For those leases in which Lonestar operates with other working interest owners, the Company recognizes oil revenue proportionate to its entitled share of volumes sold. Currently, all of Lonestar’s oil production comes from the Eagle Ford play in South Texas, and direct sales to four purchasers account for the majority of its oil sales. The Company’s oil purchase contracts are generally written to provide month-to-month terms with a 30-day cancellation notice. Sales of Lonestar’s oil production are typically invoiced monthly based on actual volumes measured at the agreed-upon delivery point and stated contract pricing for the month. NGLs and Natural Gas Revenues The Company’s NGL and natural gas purchase contracts are generally structured such that Lonestar commits and dedicates for sale a specified volume of NGL and/or natural gas production per day from agreed-upon leases to a purchaser. NGLs and natural gas are sold at a percentage of index prices of each component less any stated deductions. Control transfers at the delivery point specified in the contract, which typically is stated as the inlet or tailgate of a plant where the produced NGLs and natural gas are processed for subsequent transportation and consumption. In certain situations, Lonestar takes processed natural gas in-kind from a processing plant for sale under a separate purchase agreement with a different delivery point. The stated delivery point determines whether certain conditioning, treating, transportation and fractionation fees associated with the sold NGLs and natural gas are treated as operating expenses (occurring before the delivery point) or as deductions to revenues (occurring after the delivery point). For those leases in which Lonestar operates with other working interest owners, the Company recognizes NGL and natural gas revenue proportionate to its entitled share of volumes sold. Currently, all of Lonestar’s NGL and natural gas production comes from the Eagle Ford play in South Texas. Sales of Lonestar’s NGL and natural gas production is typically invoiced monthly based on actual volumes at the agreed-upon delivery point and stated contract pricing and allocations for the month. Lonestar uses a third-party broker for its NGL and natural gas marketing. In this capacity, the third-party is responsible for carrying out marketing activities such as submission of nominations, receipt of payments, submission of invoices and negotiation of contracts. In this agreement, Lonestar retains final approval of contracts and is not entitled to sales proceeds from the third-party until they are collected from the related purchasers. Commissions payable to the third-party broker for these services are treated as operating expenses in the financial statements. Production Imbalances The Company follows the sales method of accounting for natural gas imbalances, whereby revenue is recorded based on the Company’s share of volumes sold, regardless of whether the Company has taken its proportional share of volumes produced. A receivable or liability is recognized only to the extent that the Company has an imbalance on a specific property greater than the expected remaining proved reserves. There were no imbalances at June 30, 2018 and 2017 . Significant Judgements As noted above, the Company engages in various types of transactions in which midstream entities process its gas and subsequently market resulting NGLs and residue gas to third-party customers on Lonestar’s behalf. These types of transactions require judgement to determine whether Lonestar is the principal or the agent in the contract and, as a result, whether revenues are recorded gross or net. The Company has determined that each unit of product represents a separate performance obligation under the terms of its purchase contracts, and therefore, future volumes are wholly unsatisfied. Therefore, the Company has utilized the practical expedient exempting a Company from disclosure of the transaction price allocated to remaining performance obligations if the variable consideration is allocated entirely to a wholly unsatisfied performance obligation. Prior-Period Performance Obligations The Company records revenue in the month production is delivered to the purchaser. As noted above, settlement statements for certain NGL and natural gas sales may not be received for 30 to 60 days after the date production is delivered, and as a result, Lonestar is required to estimate the amount of production that was delivered to the purchaser and the price that will be received for the sale of the product. The Company records the differences between its estimates and the actual amounts received for product sales in the month that payment is received from the purchaser. Lonestar has existing internal controls in place for its estimation process, and any identified differences between its revenue estimates and actual revenue received historically have not been significant. For the three and six months ended June 30, 2018 , revenue recognized in the reporting period related to performance obligations satisfied in prior reporting periods was not material. Accounts Receivable and Other Accounts receivable – Oil, natural gas liquid and natural gas sales on our Unaudited Condensed Consolidated Balance Sheets consist of amounts due from purchasers for commodity sales from our Eagle Ford fields. Payments from purchasers are typically due by the last day of the month following the month of delivery. There was no bad debt expense for any period presented, and we do not provide an allowance for uncollectible accounts. The Company’s operations do not result in any contract assets or liabilities on the balance sheets.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements In accordance with ASC 820, Fair Value Measurements and Disclosures , fair value measurements are based upon inputs that market participants use in pricing an asset or liability, which are classified into two categories: observable inputs and unobservable inputs. Observable inputs represent market data obtained from independent sources, whereas unobservable inputs reflect a company’s own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. ASC 820 prioritizes the inputs used in measuring fair value into the following fair value hierarchy: • Level 1 – Quoted prices for identical assets or liabilities in active markets. • Level 2 – Quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs derived principally from or corroborated by observable market data by correlation or other means. • Level 3 – Unobservable inputs for the asset or liability. The fair value input hierarchy level to which an asset or liability measurement falls in its entirety is determined based on the lowest level input that is significant to the measurement in its entirety. Non-recurring fair value measurements include certain non-financial assets and liabilities as may be acquired in a business combination and thereby measured at fair value; impaired oil and natural gas property assessments; warrants issued in equity offerings and the initial recognition of asset retirement obligations for which fair value is used. These estimates are derived from historical costs as well as management’s expectation of future cost environments. As there is no corroborating market activity to support the assumptions used, the Company has designated these estimates as Level 3. The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 , for each fair value hierarchy level: Fair Value Measurements Using In thousands Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total June 30, 2018 (unaudited) Assets Commodity derivatives $ — $ 145 $ — $ 145 Liabilities: Commodity derivatives $ — $ (49,756 ) $ — $ (49,756 ) Warrant — — (4,086 ) (4,086 ) Deferred compensation (1,143 ) — (1,686 ) (2,829 ) Total $ (1,143 ) $ (49,611 ) $ (5,772 ) $ (56,526 ) December 31, 2017 Assets: Commodity derivatives $ — $ 472 $ — $ 472 Liabilities: Commodity derivatives $ — $ (22,138 ) $ — $ (22,138 ) Warrant — — (1,471 ) (1,471 ) Deferred compensation — — (314 ) (314 ) Total $ — $ (21,666 ) $ (1,785 ) $ (23,451 ) Level 3 Gains and Losses The table below sets forth a summary of changes in the fair value of the Company’s Level 3 liabilities for the six months ended June 30, 2018 : In thousands Warrant Deferred Compensation Total Balance as of December 31, 2017 $ (1,471 ) $ (314 ) $ (1,785 ) Unrealized losses (2,615 ) (1,372 ) (3,987 ) Balance as of June 30, 2018 (unaudited) $ (4,086 ) $ (1,686 ) $ (5,772 ) The derivative asset and liability fair values reported in the consolidated balance sheets are as of the balance sheet date and subsequently change because of changes in commodity prices, market conditions and other factors. The Company typically has numerous hedge positions that span several time periods and often result in both derivative assets and liabilities with the same counterparty, which positions are all offset to a single derivative asset or liability in the consolidated balance sheets, including the deferred premiums associated with its hedge positions. The Company nets the fair values of its derivative assets and liabilities associated with derivative instruments executed with the same counterparty pursuant to ISDA master agreements, which provide for net settlement over the term of the contract and in the event of default or termination of the contract. The book values of cash and cash equivalents, receivables for oil, NGL and natural gas sales, joint interest billings, notes and other receivables, accounts payable, and accrued liabilities approximate fair value due to the short-term nature of these instruments. The carrying value of debt approximates fair value since it is subject to a short-term floating interest rate that approximates the rate available to the Company, except for bonds, which are recorded at amortized cost less debt issuance costs. The fair value of the 11.25% Senior Notes (as defined in Note 8 below) approximates $250.0 million as of June 30, 2018 , and the notes are considered a Level 3 liability, as they are based on market transactions that occur infrequently as well as internally generated inputs.

Accrued Liabilities

Accrued Liabilities	6 Months Ended
	Jun. 30, 2018
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities Accrued liabilities consisted of the following as of the dates indicated: In thousands June 30, December 31, Bonus payable $ 1,023 $ 2,250 Payroll payable 22 18 Accrued interest - 8.75% Senior Notes — 2,768 Accrued interest -11.25% Senior Notes 13,828 — Accrued interest - other 75 1,015 Accrued rent 312 156 Accrued well costs 8,204 8,386 Third party payments for joint interest expenditures 5,778 — Accrued severance, property and franchise taxes 1,294 115 Accrued federal income tax 442 1,147 Other 540 728 Total accrued liabilities $ 31,518 $ 16,583

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The following long-term debt obligations were outstanding as of the dates indicated: In thousands June 30, December 31, Senior Secured Credit Facility $ 84,000 $ 142,080 8.75% Senior Notes due 2019 — 151,848 11.25% Senior Notes due 2023 250,000 — Mortgage debt 9,218 7,891 Other 263 759 Total long-term debt 343,481 302,578 Unamortized discount (5,063 ) (949 ) Unamortized debt issuance costs (1,154 ) (474 ) Total long-term debt net of debt issuance costs $ 337,264 $ 301,155 Senior Secured Credit Facility In July 2015, the Company, through its subsidiary Lonestar Resources America, Inc. ("LRAI"), entered into a $500 million Senior Secured Credit Facility with Citibank, N.A., as administrative agent, and other lenders party thereto (as amended, supplemented or modified from time to time, the “Credit Facility”), which has a maturity date of July 29, 2020 . As of June 30, 2018 , $84.0 million was borrowed under the Credit Facility, and the weighted average interest rate on borrowings under the Credit Facility was 5.66% . The Credit Facility may be used for loans and, subject to a $2.5 million sub-limit, letters of credit, and provides for a commitment fee of 0.375% to 0.5% based on the unused portion of the borrowing base under the Credit Facility. The Company was in compliance with the terms of the Credit Facility as of June 30, 2018 . In January 2018, the Company entered into the Limited Waiver, Borrowing Base Redetermination Agreement, and Amendment No. 7 to the Credit Agreement, which included the following provisions: • maintained the borrowing base of $160 million until the next redetermination date; • waived the borrowing base redetermination that would otherwise have occurred in connection with the incurrence of the 11.25% Senior Notes (see below), and • amended certain other provisions of the Credit Facility. As a result of the the May 2018 redetermination, the borrowing base was increased from $160 million to $190 million . Issuance of 11.25% Senior Notes In January 2018, the Company issued $250.0 million of 11.250% senior notes due 2023 (the “ 11.25% Senior Notes”) to U.S.-based institutional investors. The net proceeds of $244.4 million were used to fully retire the 8.75% Senior Notes (as defined below), which included principal, interest and a prepayment premium of approximately $162.0 million . The remaining net proceeds were used to reduce borrowings under the Credit Facility. The 11.25% Senior Notes mature on January 1, 2023 , and bear interest at the rate of 11.25% per year, payable on January 1 and July 1 of each year, beginning July 1, 2018 . At any time prior to January 1, 2021 , the Company may, on any one or more occasions, redeem up to 35% of the aggregate principal amount of the 11.25% Senior Notes with an amount of cash not greater than the net cash proceeds of certain equity offerings at a redemption price equal to 111.25% of the principal amounts redeemed, plus accrued and unpaid interest, provided that at least 65% of the aggregate principal amount of 11.25% Senior Notes originally issued remains outstanding immediately after such redemption and the redemption occurs within 180 days of the closing date of such equity offering. At any time prior to January 1, 2021, the Company may, on any one or more occasions, redeem all or a part of the 11.25% Senior Notes at a redemption price equal to 100% of the principal amount redeemed, plus a “make-whole” premium as of, and accrued and unpaid interest. On and after January 1, 2021, the Company may redeem the 11.25% Senior Notes, in whole or in part, plus accrued and unpaid interest, at the following redemption prices: 108.438% after January 1, 2021; 105.625% after January 1, 2022; and 100% after July 1, 2022. The indenture contains certain restrictions on the Company’s ability to incur additional debt, pay dividends on the Company’s common stock, make investments, create liens on the Company’s assets, engage in transactions with affiliates, transfer or sell assets, consolidate or merger, or sell substantially all of the Company’s assets. Retirement of 8.75% Senior Notes Using proceeds from the issuance of the 11.25% Senior Notes, as discussed above, the Company fully retired the 8.750% Senior Unsecured Notes due April 15, 2019 (“the 8.75% Senior Notes”). Pursuant to the terms of the indenture, the 8.75% Senior Notes were redeemed at 104.375% of the outstanding principal amount, or approximately $158.5 million , which excludes accrued interest. In connection with this transaction, the Company recognized a $8.6 million loss on extinguishment during the first quarter of 2018.

Stockholders_ Equity

Stockholders’ Equity	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Stockholders’ Equity	Stockholders’ Equity Series A & B Preferred Stock In June 2017, in connection with financing the Battlecat and Marquis Acquisitions, the Company issued 5,400 shares of Series A-1 Convertible Participating Preferred Stock, par value $0.001 per share (the “Series A-1 Preferred Stock”) and 74,600 shares of Series A-2 Convertible Participating Preferred Stock, par value $0.001 per share (the “Series A-2 Preferred Stock” and, together with the Series A-1 Preferred Stock, the “Series A Preferred Stock”), to Chambers Energy Capital (“Chambers”). Also in June 2017, in connection with the Battlecat and Marquis Acquisitions, the Company issued 1,184,632 and 1,500,000 shares of Series B Preferred Stock to Battlecat and Marquis, respectively (see Note 3, Acquisitions and Divestitures). Pursuant to the terms of the Chambers agreement, the Company agreed to use commercially reasonable efforts to hold a stockholder meeting (the “Stockholder Meeting”) to obtain stockholder approval of the issuance of shares of the Company’s Class A voting common stock issuable upon conversion of all shares of Series A-1 Preferred Stock and Series A-2 Preferred Stock (upon their conversion to shares of Series A-1 Preferred Stock) issued or issuable pursuant to the agreement (the “Stockholder Approval”). The Stockholder Meeting was held on November 3, 2017, and Stockholder Approval was obtained. As a result of the Stockholder Approval, all outstanding Series A-2 Preferred Stock was converted to Series A-1 Preferred Stock. Also, on November 3, 2017, in accordance with the terms of the Series B Certificate of Designations, all of the outstanding shares of the Company’s Series B Preferred Stock were converted on a one-for-one basis into shares of the Company’s Class A voting common stock. After the Chambers agreement closing, and for so long as the Approved Holders (as defined) beneficially own at least 10% of the total number of outstanding shares of Class A voting common stock and Class B non-voting common stock (collectively, “Common Stock”) of the Company, on an as-converted basis, or at least 15% of the number of Series A Preferred Stock issued to Chambers, the Company cannot undertake certain actions without the prior consent of holders of a majority of all shares of Common Stock, on an as-converted basis, held by the Approved Holders. Prior to June 15, 2020, Chambers and its affiliates are prohibited from directly or indirectly engaging in any short sales involving the Common Stock or securities convertible into, or exercisable or exchanged for, Common Stock. Without the prior written consent of the board, the Approved Holders are subject to customary standstill restrictions until the earlier of (i) the two-year anniversary of the date the Approved Holders are no longer entitled to designate any director to the Board and (ii) the date the Company fails to fully declare and pay all accrued dividends on either series of the Series A Preferred Stock after there are no PIK Quarters (as defined below) remaining. In connection with the closing and the issuance of shares of Series A Preferred Stock, the Company entered into a registration rights agreement with Chambers (the “Chambers RRA”). Under the Chambers RRA, the Company has agreed to provide to Chambers certain customary demand and piggyback registration rights relating to Chambers’ ownership of Company stock. The Chambers RRA contains customary terms and conditions, including certain customary indemnification obligations. The Series A-1 Preferred Stock ranks senior to Class A voting common stock with respect to dividend rights and rights upon the liquidation, winding-up or dissolution of the Company, and the series initially has a stated value of $1,000 per share. Holders of Series A-1 Preferred Stock are entitled to vote with holders of Class A voting common stock on an as-converted basis. Shares of Series A-1 Preferred Stock are convertible into shares of Class A voting common stock at the option of the holders of such Series A-1 Preferred Stock at a per share rate (the “Conversion Rate”) equal to the Stated Value of such share divided by six, subject to certain adjustments (the “Conversion Price”). The Company has the option to convert Series A-1 Preferred Stock to Class A voting common stock if the volume weighted average price of Class A voting common stock exceeds the following percentages of the Conversion Price for twenty out of thirty consecutive trading days: (i) 200% , if such mandatory conversion occurs prior to June 15, 2019, (ii) 175% , if such mandatory conversion occurs after June 15, 2019 but before June 15, 2020, and (iii) 150% , if such mandatory conversion occurs after June 15, 2020. Holders of Series A Preferred Stock are entitled to cumulative dividends payable quarterly initially at a rate of 9% per annum (the “Dividend Rate”) in cash and, for any 12 quarters (“PIK Quarters”), at the Company’s option, (i) in the form of additional shares of the respective series of Series A Preferred Stock at a per share price equal to $975 or (ii) by increasing Stated Value, in lieu of cash (collectively, the “PIK Option”). After the 12 PIK Quarters, if the Company fails to fully declare and pay dividends in cash, then the Dividend Rate for Series A Preferred Stock will automatically increase by 5.0% per annum for the next succeeding dividend period and then an additional 1.0% for each successive dividend period, up to a maximum Dividend Rate of 20.0% per annum, until the Company pays dividends at such increased rate fully in cash for two consecutive quarters. In addition to dividends rights described above, holders of the Series A Preferred Stock are entitled to receive dividends or distributions declared or paid on Class A voting common stock on an as-converted basis. If on June 15, 2024, the Prevailing Price is less than the Conversion Price then in effect, the Dividend Rate for Series A-1 Preferred Stock will automatically increase to 20.0% per annum, payable only in cash, unless automatically converted as described above. However, the Company, at its option, may instead elect to exchange each share of Series A-1 Preferred Stock for senior unsecured notes of the Company with a two -year maturity, a 9.0% per annum coupon payable semi-annually in cash, and governed by terms substantially similar to the Company’s most recent high yield indenture at that time. After June 15, 2020, the Company may redeem shares of Series A Preferred Stock in cash at a per share amount equal to (i) 110% of the Stated Value, if the redemption occurs prior to June 15, 2021, (ii) 105% of the Stated Value, if the redemption occurs prior to June 15, 2022, and (iii) 100% of the Stated Value, if the redemption occurs after June 15, 2022, in each case, plus any unpaid dividends. For the third and fourth quarters of 2017, the Company elected the PIK Option for the Class A Preferred Stock dividend payment, which resulted in the issuance of 1,991 additional shares of Series A-1 Preferred Stock and 1,977 additional shares of Series A-2 Preferred Stock, which were subsequently converted to shares of Series A-1 Preferred Stock during the fourth quarter of 2017. For the first and second quarters of 2018, the Company also elected the PIK Option for the Class A Preferred Stock dividend payment, which resulted in the issuance of 3,821 additional shares of Series A-1 Preferred Stock during the six months ended June 30, 2018 . Common Stock Issuances On November 3, 2017, as described above, the Company issued 2,684,632 shares of Class A voting common stock on a one-for-one basis in exchange for all of the of the Company’s outstanding Series B Preferred Stock.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Restricted Stock Units In February 2017, the Company granted awards of restricted stock units (“RSUs”) covering 612,000 shares to certain of its employees. In August 2017, 100,000 units were granted to the Company’s chairman of the board of directors, and in October 2017, 28,409 units were granted to the Company’s internal general counsel. In April and May 2018, 585,000 and 7,500 additional units were granted to certain of its employees, respectively. The awards vest over a three -year period as follows: 40% on the first anniversary of issuance and 30% on each of the second and third anniversaries of issuance, such that the RSU’s will be fully vested on the third anniversary of issuance. The Company determined the fair value of granted RSUs based on the market price of the Class A voting common stock of the Company on the date of grant. RSUs are paid in Class A voting common stock or cash, at the Company’s option, after the vesting of the applicable RSU. Compensation expense for granted RSUs is recognized over the vesting period. In February 2018, the Company elected to offer cash settlement to all employees for vested RSUs and, as a result of this modification, the RSU awards are classified as a liability on the Company’s balance sheet in accordance with ASC 718, Compensation – Stock Compensation, as of June 30, 2018. As of the date of the modification, periodic compensation expense related to the awards is recognized based on the fair value of the awards, subject to a floor valuation that represents the compensation expense amount that would have otherwise been recognized had the Company not modified the terms of the award. The modification of the RSU awards resulted in $0.2 million in incremental costs to the Company for both the three and six months ended June 30, 2018. The liability for RSUs on the Unaudited Condensed Consolidated Balance Sheet as of June 30, 2018 was $1.1 million . The following table presents RSUs activity during the six months ended June 30, 2018 : Shares Weighted Average Remaining Contractual Term (in years) Non-vested RSUs at December 31, 2017 728,909 2.2 Granted 592,500 2.8 Vested (284,200 ) — Forfeited (7,500 ) — Non-vested RSUs at June 30, 2018 1,029,709 2.3 Stock Appreciation Rights In February 2017, the Company granted awards of stock appreciation rights (“SARs”) covering 700,000 shares to certain of its employees and its non-employee directors. In April 2018, the Company granted additional awards of SARs covering 335,000 shares to certain of its employees and its non-employee directors. The awards vest over a three -year period as follows: 40% on the first anniversary of issuance and 30% on each of the second and third anniversaries of issuance, such that the SAR’s will be fully vested on the third anniversary of issuance. The SARs will expire five -years after the date of issuance. The exercise price of the SAR is the fair market value of the Company’s Class A voting common stock on the date of the grant. The SAR entitles the holder to receive from the Company, upon exercise of the exercisable portion of the SAR, an amount determined by multiplying the excess of the fair market value of one share on the date of exercise over the exercise price per share by the number of shares with respect to which the SAR is exercised. SARs will be paid in cash or common stock at holder’s election once the SAR is vested, with the provision that the Company possesses sufficient liquidity to allow for cash settlement of the SAR. The SARs are accounted for as a liability on the Unaudited Condensed Consolidated Balance Sheets, which was approximately $1.7 million as of June 30, 2018. The following table presents SARs activity during the six months ended June 30, 2018 : Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in years) Outstanding at December 31, 2017 690,000 $ 7.20 4.3 SARs vested and exercisable at December 31, 2017 — — — Granted 335,000 4.46 4.8 Exercised — — — Expired/forfeited (7,500 ) — — Outstanding at June 30, 2018 1,017,500 $ 6.30 4.0 SARs vested and exercisable at June 30, 2018 280,000 $ 7.20 3.6 Stock-Based Compensation Expense For the three and six months ended June 30, 2018, the Company recorded stock-based compensation expenses of approximately $2.3 million and $2.7 million , respectively, related to RSUs and SARs. As of June 30, 2018, the total unrecognized stock-based compensation cost to be recognized over the next three years is approximately $9.2 million .

Related Party Activities

Related Party Activities	6 Months Ended
	Jun. 30, 2018
Related Party Transactions [Abstract]
Related Party Activities	Related Party Activities Leucadia In August 2016, LRAI and the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with Juneau, as initial purchaser, Leucadia as guarantor of Juneau’s obligations, the other purchasers party thereto and Jefferies, LLC, in its capacity as the collateral agent for the purchasers, relating to the issuance and sale of (i) up to $49.9 million aggregate principal amount of LRAI’s 12% senior secured second lien notes due 2021 (“Second Lien Notes”) and (ii) five-year warrants to purchase up to an aggregate 998,000 shares of the Company’s Class A voting common stock at a price equal to $5.00 per share (the “Warrants”). During 2016, LRAI issued $25.0 million in aggregate principal amount of Second Lien Notes and the Company issued Warrants to purchase 500,000 shares of its Class A voting common stock to Juneau. In December 2016, LRAI repaid to Juneau $21.0 million principal of the Second Lien Notes. In connection with entering into the Purchase Agreement, the Company also entered into a registration rights agreement and an equity commitment agreement. Pursuant to the registration rights agreement, the Company had agreed to register for resale certain Class A voting common stock issued or issuable to Juneau and Leucadia, including those issuable upon exercise of the Warrants. The Form S-3 registration statement was filed with the Securities and Exchange Commission on November 7, 2017, and is effective. Leucadia agreed, pursuant to the equity commitment agreement, to purchase a certain number of Class A voting common stock in case the Company elected to pursue an equity offering prior to December 31, 2016. Pursuant to the equity commitment agreement, Leucadia purchased 3,478,261 shares of Class A voting common stock (costing $20 million ) through a common stock offering, which closed in December 2016. In connection with Leucadia’s equity commitment, the Company paid Leucadia in January 2017 a $1.0 million fee, which was recorded as a reduction to additional paid-in capital. In the event Leucadia purchased not less than its commitment amount, the Company agreed to use commercially reasonable efforts to enter into arrangements to provide Leucadia with the right to appoint one director to the Board of the Company, provided that such right will terminate at such time as Leucadia and its affiliates own a number of shares of Class A voting common stock equal to less than 50% of the shares purchased by Leucadia and its affiliates in such offering. Leucadia has elected to take an observer position on the board of directors, with no voting rights. EF Realisation In October 2016, the Company entered into a Board Representation Agreement (the “Board Representation Agreement”) with EF Realisation Company Limited (“EF Realisation”). Under the Board Representation Agreement, for as long as EF Realisation, together with its affiliates, beneficially owns 15% or more of the issued and outstanding shares of the Company’s Class A voting common stock, it has the right to nominate up to, but no more than, two directors to serve on the Board and for as long as EF Realisation, together with its affiliates, beneficially owns at least 10% but less than 15% of the Company’s issued and outstanding shares of Class A voting common stock, it has the right to nominate up to, but no more than, one director to serve on the Board. Also in October 2016, the Company entered into a Registration Rights Agreement with EF Realisation, pursuant to which the Company agreed to register for resale Class A voting common stock indirectly owned by EF Realisation. The Form S-3 registration statement was filed with the Securities and Exchange Commission on November 7, 2017 and is effective. The Company has also granted EF Realisation certain piggyback and demand registration rights. Amendment of Registration Rights Agreement In connection with the Battlecat and Marquis acquisitions, in June 2017, the Company entered into (i) a first amendment to the registration rights agreement (the “Leucadia RRA Amendment”) with Leucadia and JETX Energy, LLC (f/k/a Juneau Energy, LLC), which amends the registration rights agreement by and among the same parties, and (ii) a first amendment to registration rights agreement (the “EF RRA Amendment” and, together with the Leucadia RRA Amendment, the “RRA Amendments”) with EF Realisation, which amends the registration rights agreement from October 2016 by and between the same parties. The RRA Amendments set forth the relative priorities, with respect to demand and piggyback registration rights, among each applicable party thereto, Battlecat, Marquis and Chambers under their respective registration rights agreements with the Company. Other Related Party Transactions New Tech Global Ventures, LLC, a company in which Daniel R. Lockwood (a director of the Company) owns a limited partnership interest, has provided field engineering staff and consultancy services for the Company since 2013. The total cost for such services was approximately $339 thousand and $156 thousand for the three months ended June 30, 2018 and 2017, respectively, and $674 thousand and $388 thousand for the six months ended June 30, 2018 and 2017 , respectively.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies In February 2018, the Company signed a rig under contract, the original term of which was completed during the second quarter of 2018. As of August 2018, the terms of the extended contract provide for a drilling rate of $22.5 thousand per day with either party eligible to terminate the contract with 30 days' notice. In March 2018, the Company signed a dedicated fleet contract that provides for hydraulic fracturing and wireline services at variable rates depending on the work performed. The early termination fee equals $133 thousand for each scheduled wells that is not hydraulically fractured as of the date of termination. The contract expires on December 31, 2018 . As of August 2018, the Company is currently hydraulically fracturing three wells with a balance of three wells from the original contract remaining. The Company has the ability to extend the contract on any additional wells added to the 2018 drilling schedule.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Interim Financial Statements	Interim Financial Statements The accompanying unaudited condensed consolidated financial statements of Lonestar Resources US Inc., and its subsidiaries have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (“SEC”) and do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These financial statements and the notes thereto should be read in conjunction with our Annual Report on Form 10-K/A for the year ended December 31, 2017 (the “Form 10-K/A”). Unless indicated otherwise or the context requires, the terms “we,” “our,” “us,” “Company” or “Lonestar,” refer to Lonestar Resources US Inc. and its subsidiaries. Accounting measurements at interim dates inherently involve greater reliance on estimates than at year end, and the results of operations for the interim periods shown in this report are not necessarily indicative of results to be expected for the year. In management’s opinion, the accompanying unaudited condensed consolidated financial statements include all adjustments of a normal recurring nature necessary for a fair statement of our consolidated financial position as of June 30, 2018 , our consolidated results of operations for the three and six months ended June 30, 2018 and 2017 , and our consolidated cash flows for the six months ended June 30, 2018 and 2017 .
Reclassifications	Reclassifications Certain prior period amounts have been reclassified to conform to the current year presentation. Such reclassifications had no impact on our reported net loss, current assets, current liabilities, total liabilities or stockholders’ equity.
Net Loss per Common Share	Net Loss per Common Share Basic net loss per common share is computed by dividing the net loss attributable to common stockholders by the weighted average number of common stock outstanding during the period. Diluted net loss per common share is calculated in the same manner but includes the impact of potentially dilutive securities. Potentially dilutive securities consist of warrants, equity compensation awards and preferred equity shares under the as-converted method.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Leases. In February 2016, the FASB issued ASU 2016-02, Leases (“ASU 2016-02”), which will require organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. Additional qualitative and quantitative disclosures will also be required. ASU 2016-02 is effective for the annual period beginning after December 15, 2018, including interim periods within those fiscal years, and early adoption is permitted. Currently, entities must adopt the standard using a modified retrospective transition and apply the guidance to the earliest comparative period presented, with certain practical expedients that entities may elect to apply. Changes to processes and internal controls to meet the standard’s reporting and disclosure requirements have been identified and are being implemented. In addition to lease agreements, service contracts and other agreements are also being reviewed to determine if they contain an embedded lease. The Company continues to evaluate the expected impact of this standard update on disclosures, but does not anticipate any material changes to operating results or liquidity as a result of right-of-use assets and corresponding lease liabilities that will be recorded. Revenue Recognition. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which created Accounting Standards Codification (“ASC”) 606, Revenue from Contracts with Customers (“ASC 606”). The objective of ASU 2014-09 is greater consistency and comparability across industries by using a five-step model to recognize revenue from customer contracts. Effective January 1, 2018, the Company adopted ASU 2014-09, using the modified retrospective method applied to contracts that were not completed as of January 1, 2018. Under the modified retrospective method, the Company recognizes the cumulative effect of initially applying ASU 2014-09 as an adjustment to the opening balance of accumulated deficit; however, no significant adjustment was required as a result of adopting the new standard. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606. The comparative information has not been restated and continues to be reported under historic accounting standards in effect for those periods. The impact of the adoption of ASU 2014-09 is expected to be immaterial to the Company’s net income on an ongoing basis. See Note 5. Revenue Recognition, for further discussion.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Reconciliation of Weighted Average Shares Used in Basic and Diluted Net (Loss) Income Per Common Share Calculations	The following table is a reconciliation of the weighted average shares used in the basic and diluted net loss per common share calculations for the periods indicated: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Basic weighted average common shares outstanding 24,599,744 21,822,015 24,598,345 21,822,015 Potentially dilutive securities Warrants — — — — Restricted stock units — — — — Diluted weighted average common shares outstanding 24,599,744 21,822,015 24,598,345 21,822,015
Schedule of Potentially Dilute Earnings Per Share in Future Were Excluded in the Computation of Diluted Net (Loss) Income Per Share as They Were Anti-dilutive	The following securities could potentially dilute earnings per share in the future, but were excluded from the computation of diluted net loss per share, as their effect would have been antidilutive: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Preferred stock 14,313,038 2,490,842 14,156,471 1,252,302 Warrants 760,000 760,000 760,000 760,000 Stock appreciation rights 999,643 682,500 841,948 487,956 Restricted stock units 1,002,072 602,000 726,919 432,796

Restatement of Previously Iss_2

Restatement of Previously Issued Financial Statements (Tables)	6 Months Ended
	Jun. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Schedule of error corrections and prior period adjustments	The table below sets forth the condensed consolidated statement of stockholders’ equity, including the balances originally reported, corrections and the as restated balances for the period: Total Accumulated Stockholders' (In thousands) Deficit Equity Balance at June 30, 2018, as previously reported $ (137,608 ) $ 179,516 Correction (14,358 ) (14,358 ) Balance at June 30, 2018, as restated (151,966 ) 165,158 The table below sets forth the condensed consolidated statements of operations, including the balances originally reported, corrections and the as restated balances for each period: Three Months Ended June 30, 2018 June 30, 2017 (In thousands except per share data) As Previously Reported Correction As Restated As Previously Reported Correction As Restated Depreciation, depletion and amortization $ 19,464 $ 1,273 $ 20,737 $ 12,551 $ 947 $ 13,498 Total expenses 34,017 1,273 35,290 50,715 947 51,662 Income (loss) from operations 13,835 (1,273 ) 12,562 (32,580 ) (947 ) (33,527 ) Loss before income taxes (23,423 ) (1,273 ) (24,696 ) (35,369 ) (947 ) (36,316 ) Income tax benefit (expense) 4,648 (1,545 ) 3,103 12,208 393 12,601 Net loss attributable to common stockholders (20,707 ) (2,818 ) (23,525 ) (23,457 ) (554 ) (24,011 ) Net loss per common share: Basic $ (0.84 ) $ (0.12 ) $ (0.96 ) $ (1.07 ) $ (0.03 ) $ (1.10 ) Diluted $ (0.84 ) $ (0.12 ) $ (0.96 ) $ (1.07 ) $ (0.03 ) $ (1.10 ) Six Months Ended June 30, 2018 June 30, 2017 (In thousands except per share data) As Previously Reported Correction As Restated As Previously Reported Correction As Restated Depreciation, depletion and amortization $ 35,027 $ 1,135 $ 36,162 $ 24,693 $ 779 $ 25,472 Total expenses 61,307 1,135 62,442 69,663 779 70,442 Income (loss) from operations 23,237 (1,135 ) 22,102 (33,912 ) (779 ) (34,691 ) Loss before income taxes (43,206 ) (1,135 ) (44,341 ) (30,717 ) (779 ) (31,496 ) Income tax benefit (expense) 7,778 (1,567 ) 6,211 10,621 277 10,898 Net loss attributable to common stockholders (39,249 ) (2,702 ) (41,951 ) (20,392 ) (502 ) (20,894 ) Net loss per common share Basic $ (1.60 ) $ (0.11 ) $ (1.71 ) $ (0.93 ) $ (0.03 ) $ (0.96 ) Diluted $ (1.60 ) $ (0.11 ) $ (1.71 ) $ (0.93 ) $ (0.03 ) $ (0.96 ) The table below sets forth the condensed consolidated balance sheet, including the balances originally reported, corrections and the as restated balances for the restated period: June 30, 2018 (In thousands) As Previously Reported Correction As Restated Assets Accumulated depreciation, depletion and amortization $ (294,049 ) $ (16,127 ) (310,176 ) Net property and equipment 633,880 (16,127 ) 617,753 Deferred tax assets, net — 1,662 1,662 Total assets 656,723 (14,465 ) 642,258 Liabilities and Stockholders' equity Deferred tax liabilities, net 106 (106 ) — Total long-term liabilities 374,508 (106 ) 374,402 Accumulated deficit (137,608 ) (14,358 ) (151,966 ) Total stockholders' equity 179,516 (14,358 ) 165,158 The table below sets forth the condensed consolidated statements of cash flows from operating activities, including the balances originally reported, corrections and the as restated balances for each period: Six Months Ended June 30, 2018 June 30, 2017 (In thousands) As Previously Reported Correction As Restated As Previously Reported Correction As Restated Cash flows from operating activities: Net (loss) income (35,428 ) (2,702 ) (38,130 ) $ (20,096 ) $ (502 ) $ (20,598 ) Depreciation, depletion and amortization 35,027 1,135 36,162 24,693 779 25,472 Deferred taxes (7,999 ) 1,567 (6,432 ) (10,985 ) (277 ) (11,262 ) Net cash provided by operating activities 38,751 — 38,751 17,112 — 17,112

Commodity Price Risk Activiti_2

Commodity Price Risk Activities (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Commodity Derivative Contracts	The following table summarizes the Company’s commodity derivative contracts as of June 30, 2018 : Commodity Contract Type Period Volume Hedged (Bbls/MMBtu per day) Weighted Average Price Swap Floor Ceiling Oil -WTI Swaps July-December 2018 6,689 $ 56.45 — — Oil -WTI 2-Way Collar July-December 2018 500 — $ 50.00 $ 59.45 Oil -WTI Swaps January-December 2019 4,930 51.21 — — Oil -WTI Swaps January-December 2020 1,684 53.02 — — Natural Gas - Henry Hub Swaps July-December 2018 7,393 3.05 — —

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2018
Disaggregation of Revenue [Abstract]
Summary of Operating Revenues are Comprised of Sales of Crude Oil, NGLs and Natural Gas	Operating revenues are comprised of sales of crude oil, NGLs and natural gas. In thousands Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Oil $ 39,707 $ 15,090 $ 72,859 $ 29,580 NGLs 4,410 1,319 6,143 2,989 Natural gas 3,735 1,726 5,542 3,182 Total operating revenues $ 47,852 $ 18,135 $ 84,544 $ 35,751

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 , for each fair value hierarchy level: Fair Value Measurements Using In thousands Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total June 30, 2018 (unaudited) Assets Commodity derivatives $ — $ 145 $ — $ 145 Liabilities: Commodity derivatives $ — $ (49,756 ) $ — $ (49,756 ) Warrant — — (4,086 ) (4,086 ) Deferred compensation (1,143 ) — (1,686 ) (2,829 ) Total $ (1,143 ) $ (49,611 ) $ (5,772 ) $ (56,526 ) December 31, 2017 Assets: Commodity derivatives $ — $ 472 $ — $ 472 Liabilities: Commodity derivatives $ — $ (22,138 ) $ — $ (22,138 ) Warrant — — (1,471 ) (1,471 ) Deferred compensation — — (314 ) (314 ) Total $ — $ (21,666 ) $ (1,785 ) $ (23,451 )
Summary of Changes in Fair Value for the Level 3 Liabilities	The table below sets forth a summary of changes in the fair value of the Company’s Level 3 liabilities for the six months ended June 30, 2018 : In thousands Warrant Deferred Compensation Total Balance as of December 31, 2017 $ (1,471 ) $ (314 ) $ (1,785 ) Unrealized losses (2,615 ) (1,372 ) (3,987 ) Balance as of June 30, 2018 (unaudited) $ (4,086 ) $ (1,686 ) $ (5,772 )

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	6 Months Ended
	Jun. 30, 2018
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following as of the dates indicated: In thousands June 30, December 31, Bonus payable $ 1,023 $ 2,250 Payroll payable 22 18 Accrued interest - 8.75% Senior Notes — 2,768 Accrued interest -11.25% Senior Notes 13,828 — Accrued interest - other 75 1,015 Accrued rent 312 156 Accrued well costs 8,204 8,386 Third party payments for joint interest expenditures 5,778 — Accrued severance, property and franchise taxes 1,294 115 Accrued federal income tax 442 1,147 Other 540 728 Total accrued liabilities $ 31,518 $ 16,583

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Schedule of Long-Term Debt Outstanding	The following long-term debt obligations were outstanding as of the dates indicated: In thousands June 30, December 31, Senior Secured Credit Facility $ 84,000 $ 142,080 8.75% Senior Notes due 2019 — 151,848 11.25% Senior Notes due 2023 250,000 — Mortgage debt 9,218 7,891 Other 263 759 Total long-term debt 343,481 302,578 Unamortized discount (5,063 ) (949 ) Unamortized debt issuance costs (1,154 ) (474 ) Total long-term debt net of debt issuance costs $ 337,264 $ 301,155

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Outstanding Restricted Stock Units	The following table presents RSUs activity during the six months ended June 30, 2018 : Shares Weighted Average Remaining Contractual Term (in years) Non-vested RSUs at December 31, 2017 728,909 2.2 Granted 592,500 2.8 Vested (284,200 ) — Forfeited (7,500 ) — Non-vested RSUs at June 30, 2018 1,029,709 2.3
Schedule of Outstanding Stock Appreciation Rights	The following table presents SARs activity during the six months ended June 30, 2018 : Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in years) Outstanding at December 31, 2017 690,000 $ 7.20 4.3 SARs vested and exercisable at December 31, 2017 — — — Granted 335,000 4.46 4.8 Exercised — — — Expired/forfeited (7,500 ) — — Outstanding at June 30, 2018 1,017,500 $ 6.30 4.0 SARs vested and exercisable at June 30, 2018 280,000 $ 7.20 3.6

Basis of Presentation - Schedul

Basis of Presentation - Schedule of Reconciliation of Weighted Average Shares Used in Basic and Diluted Net (Loss) Income Per Common Share Calculations (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Basic weighted average common shares outstanding (in shares)	24,599,744	21,822,015	24,598,345	21,822,015
Diluted weighted average common shares outstanding (in shares)	24,599,744	21,822,015	24,598,345	21,822,015
Warrants
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive securities (in shares)	0	0	0	0
Restricted stock units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Potentially dilutive securities (in shares)	0	0	0	0

Basis of Presentation - Sched_2

Basis of Presentation - Schedule of Potentially Dilute Earnings Per Share in Future Were Excluded in the Computation of Diluted Net (Loss) Income Per Share as They Were Anti-dilutive (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	14,313,038	2,490,842	14,156,471	1,252,302
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	760,000	760,000	760,000	760,000
Stock appreciation rights
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	999,643	682,500	841,948	487,956
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,002,072	602,000	726,919	432,796

Restatement of Previously Iss_3

Restatement of Previously Issued Financial Statements - Condensed Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation, depletion and amortization	$ 20,737	$ 13,498	$ 36,162	$ 25,472
Total expenses	35,290	51,662	62,442	70,442
Income (loss) from operations	12,562	(33,527)	22,102	(34,691)
Loss before income taxes	(24,696)	(36,316)	(44,341)	(31,496)
Income tax benefit	3,103	12,601	6,211	10,898
Net loss attributable to common stockholders	$ (23,525)	$ (24,011)	$ (41,951)	$ (20,894)
Net loss per common share
Basic (in dollars per share)	$ (0.96)	$ (1.10)	$ (1.71)	$ (0.96)
Diluted (in dollars per share)	$ (0.96)	$ (1.10)	$ (1.71)	$ (0.96)
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation, depletion and amortization	$ 19,464	$ 12,551	$ 35,027	$ 24,693
Total expenses	34,017	50,715	61,307	69,663
Income (loss) from operations	13,835	(32,580)	23,237	(33,912)
Loss before income taxes	(23,423)	(35,369)	(43,206)	(30,717)
Income tax benefit	4,648	12,208	7,778	10,621
Net loss attributable to common stockholders	$ (20,707)	$ (23,457)	$ (39,249)	$ (20,392)
Net loss per common share
Basic (in dollars per share)	$ (0.84)	$ (1.07)	$ (1.60)	$ (0.93)
Diluted (in dollars per share)	$ (0.84)	$ (1.07)	$ (1.60)	$ (0.93)
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Depreciation, depletion and amortization	$ 1,273	$ 947	$ 1,135	$ 779
Total expenses	1,273	947	1,135	779
Income (loss) from operations	(1,273)	(947)	(1,135)	(779)
Loss before income taxes	(1,273)	(947)	(1,135)	(779)
Income tax benefit	(1,545)	393	(1,567)	277
Net loss attributable to common stockholders	$ (2,818)	$ (554)	$ (2,702)	$ (502)
Net loss per common share
Basic (in dollars per share)	$ 0	$ 0	$ 0	$ 0
Diluted (in dollars per share)	$ 0	$ 0	$ 0	$ 0

Restatement of Previously Iss_4

Restatement of Previously Issued Financial Statements - Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated depreciation, depletion and amortization	$ (310,176)	$ (274,374)
Net property and equipment	617,753	570,270
Deferred tax assets, net	1,662	0
Total assets	642,258	591,808
Deferred tax liabilities, net	0	4,769
Total long-term liabilities	374,402	324,162
Accumulated deficit	(151,966)	(113,836)
Total stockholders' equity	165,158	$ 203,690
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated depreciation, depletion and amortization	(294,049)
Net property and equipment	633,880
Deferred tax assets, net	0
Total assets	656,723
Deferred tax liabilities, net	106
Total long-term liabilities	374,508
Accumulated deficit	(137,608)
Total stockholders' equity	179,516
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accumulated depreciation, depletion and amortization	(16,127)
Net property and equipment	(16,127)
Deferred tax assets, net	1,662
Total assets	(14,465)
Deferred tax liabilities, net	(106)
Total long-term liabilities	(106)
Accumulated deficit	(14,358)
Total stockholders' equity	$ (14,358)

Restatement of Previously Iss_5

Restatement of Previously Issued Financial Statements - Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss	$ (21,593)	$ (23,715)	$ (38,130)	$ (20,598)
Depreciation, depletion and amortization			36,162	25,472
Deferred taxes			(6,432)	(11,262)
Net cash provided by operating activities			38,751	17,112
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss			(35,428)	(20,096)
Depreciation, depletion and amortization			35,027	24,693
Deferred taxes			(7,999)	(10,985)
Net cash provided by operating activities			38,751	17,112
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net loss			(2,702)	(502)
Depreciation, depletion and amortization			1,135	779
Deferred taxes			1,567	(277)
Net cash provided by operating activities			$ 0	$ 0

Restatement of Previously Iss_6

Restatement of Previously Issued Financial Statements - Condensed Consolidated Statement of Stockholders' Equity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total stockholders' equity	$ 165,158	$ 203,690
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total stockholders' equity	179,516
Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total stockholders' equity	(14,358)
Accumulated Deficit
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total stockholders' equity	(151,966)	$ (113,836)
Accumulated Deficit | As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total stockholders' equity	(137,608)
Accumulated Deficit | Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total stockholders' equity	$ (14,358)

Acquisitions and Divestitures -

Acquisitions and Divestitures - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	Aug. 02, 2017	Jun. 15, 2017	Jun. 15, 2017	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Acquisition of oil and gas properties					$ 2,862	$ 108,179
Battlecat Oil & Gas, LLC
Business Acquisition [Line Items]
Purchase consideration of oil and gas properties			$ 59,800
Acquisition of oil and gas properties			55,000
Purchase consideration paid to acquire proved reserves			56,300
Purchase consideration paid to acquire unproved reserves			2,900
Purchase consideration paid to acquire unevaluated acreage and other assets			600
Asset retirement obligations recorded with the acquisition of properties		$ 200	200
Fair value of net assets acquired			59,600
Acquisition costs			$ 1,500
Effective date of acquisition			Apr. 1, 2017
SN Marquis LLC
Business Acquisition [Line Items]
Purchase consideration of oil and gas properties			$ 50,000
Acquisition of oil and gas properties			44,000
Purchase consideration paid to acquire proved reserves			48,000
Purchase consideration paid to acquire unproved reserves			600
Purchase consideration paid to acquire unevaluated acreage and other assets			1,400
Asset retirement obligations recorded with the acquisition of properties		$ 1,900	1,900
Fair value of net assets acquired			48,100
Acquisition costs			$ 1,200
Effective date of acquisition			Jan. 1, 2017
Series B Convertible Participating Preferred Stock | Battlecat Oil & Gas, LLC
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition		1,184,632	1,184,632
Preferred Stock, par value (in dollars per share)		$ 0.001	$ 0.001
Value of shares issued in connection with acquisition			$ 4,800
Series B Convertible Participating Preferred Stock | SN Marquis LLC
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition		1,500,000	1,500,000
Value of shares issued in connection with acquisition			$ 6,000
Fort Worth, Texas
Business Acquisition [Line Items]
Acquisition price of an office building	$ 10,000
Fort Worth, Texas | Other Expense
Business Acquisition [Line Items]
Impairment charge				$ 1,600

Commodity Price Risk Activiti_3

Commodity Price Risk Activities - Additional Information (Details)	1 Months Ended	6 Months Ended
	Jul. 31, 2018$ / bblbbl	Jun. 30, 2018DeliveryObligation$ / bblbbl
Derivative [Line Items]
Number of open physical obligations | DeliveryObligation		0
Oil -WTI Swaps January-December 2019
Derivative [Line Items]
Total Volume | bbl		4,930
Weighted Average Price - Swap | $ / bbl		51.21
Oil -WTI Swaps January-December 2020
Derivative [Line Items]
Total Volume | bbl		1,684
Weighted Average Price - Swap | $ / bbl		53.02
Subsequent Event | Oil -WTI Swaps January-December 2019
Derivative [Line Items]
Total Volume | bbl	182,500
Weighted Average Price - Swap | $ / bbl	65.20
Subsequent Event | Oil -WTI Swaps January-December 2020
Derivative [Line Items]
Total Volume | bbl	183,000
Weighted Average Price - Swap | $ / bbl	61.65

Commodity Price Risk Activiti_4

Commodity Price Risk Activities - Schedule of Commodity Derivative Contracts (Details)	6 Months Ended
	Jun. 30, 2018MMBTU$ / MMBTU$ / bblbbl
Oil -WTI Swaps July-December 2018
Derivative [Line Items]
Total Volume | bbl	6,689
Weighted Average Price - Swap	56.45
Oil -WTI 2-Way Collar July-December 2018
Derivative [Line Items]
Total Volume | bbl	500
Weighted Average Price - Floor	50
Weighted Average Price - Ceiling	59.45
Oil -WTI Swaps January-December 2019
Derivative [Line Items]
Total Volume | bbl	4,930
Weighted Average Price - Swap	51.21
Oil -WTI Swaps January-December 2020
Derivative [Line Items]
Total Volume | bbl	1,684
Weighted Average Price - Swap	53.02
Natural Gas - Henry Hub Swaps July-December 2018
Derivative [Line Items]
Total Energy | MMBTU	7,393
Weighted Average Price - Swap | $ / MMBTU	3.05

Revenue Recognition - Summary o

Revenue Recognition - Summary of Operating Revenues are Comprised of Sales of Crude Oil, NGLs and Natural Gas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 47,852	$ 18,135	$ 84,544	$ 35,751
Oil sales
Revenues	39,707	15,090	72,859	29,580
Natural gas liquid sales
Revenues	4,410	1,319	6,143	2,989
Natural gas sales
Revenues	$ 3,735	$ 1,726	$ 5,542	$ 3,182

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details)	6 Months Ended
	Jun. 30, 2018USD ($)
Disaggregation of Revenue [Abstract]
Bad debt expense	$ 0
Allowance for uncollectible accounts	$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant	$ (4,086)	$ (1,471)
Deferred compensation	(2,829)	(314)
Total	(56,526)	(23,451)
Commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	145	472
Liabilities	(49,756)	(22,138)
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant	0	0
Deferred compensation	(1,143)	0
Total	(1,143)	0
Quoted Prices in Active Markets (Level 1) | Commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant	0	0
Deferred compensation	0	0
Total	(49,611)	(21,666)
Significant Other Observable Inputs (Level 2) | Commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	145	472
Liabilities	(49,756)	(22,138)
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant	(4,086)	(1,471)
Deferred compensation	(1,686)	(314)
Total	(5,772)	(1,785)
Significant Unobservable Inputs (Level 3) | Commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	$ 0	$ 0

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in Fair Value for the Level 3 Liability (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (1,785)
Unrealized losses	(3,987)
Ending balance	(5,772)
Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(1,471)
Unrealized losses	(2,615)
Ending balance	(4,086)
Deferred Compensation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(314)
Unrealized losses	(1,372)
Ending balance	$ (1,686)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - 11.25% Senior Notes - USD ($) $ in Millions	Jun. 30, 2018	Jan. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt instrument interest rate	11.25%	11.25%	11.25%
Fair value of senior notes	$ 250

Accrued Liabilities - Schedule

Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Bonus payable	$ 1,023		$ 2,250
Payroll payable	22		18
Accrued interest - other	75		1,015
Accrued rent	312		156
Accrued well costs	8,204		8,386
Third party payments for joint interest expenditures	5,778		0
Accrued severance, property and franchise taxes	1,294		115
Accrued federal income tax	442		1,147
Other	540		728
Total accrued liabilities	31,518		16,583
8.750% Senior Notes Due April 15, 2019
Debt Instrument [Line Items]
Accrued interest - Senior Notes	$ 0		$ 2,768
Debt instrument interest rate	8.75%	8.75%	8.75%
11.25% Senior Notes
Debt Instrument [Line Items]
Accrued interest - Senior Notes	$ 13,828		$ 0
Debt instrument interest rate	11.25%	11.25%	11.25%

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt Outstanding (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Senior Secured Credit Facility	$ 84,000	$ 142,080
Other	263	759
Total long-term debt	343,481	302,578
Unamortized discount	(5,063)	(949)
Unamortized debt issuance costs	(1,154)	(474)
Total long-term debt net of debt issuance costs	337,264	301,155
8.750% Senior Notes Due April 15, 2019
Debt Instrument [Line Items]
Senior Notes	0	151,848
11.25% Senior Notes
Debt Instrument [Line Items]
Senior Notes	250,000	0
Mortgages Debt
Debt Instrument [Line Items]
Mortgage debt	$ 9,218	$ 7,891

Long-Term Debt - Senior Secured

Long-Term Debt - Senior Secured Credit Facility - Additional Information (Details) - USD ($)	Jan. 04, 2018	Jul. 31, 2015	Jun. 30, 2018	May 01, 2018	Jan. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Senior Secured Credit Facility			$ 84,000,000			$ 142,080,000
Senior Secured Credit Facility
Debt Instrument [Line Items]
Senior Secured Credit Facility			$ 84,000,000
Weighted average interest rate on borrowings			5.66%
Senior secured credit facility sub limit			$ 2,500,000
Debt instrument borrowing base	$ 160,000,000			$ 190,000,000
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%
11.25% Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount					$ 250,000,000
Debt instrument maturity date	Jan. 1, 2023
Debt instrument interest rate			11.25%		11.25%	11.25%
Citibank N A | Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument maturity date		Jul. 29, 2020
LRAI | Citibank N A | Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument face amount		$ 500,000,000

Long-Term Debt - Issuance of 11

Long-Term Debt - Issuance of 11.25% Senior Notes - Additional Information (Details) - USD ($)	Jan. 04, 2018	Jan. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
January 1, 2021
Debt Instrument [Line Items]
Redemption price, percentage	108.438%
January 1, 2022
Debt Instrument [Line Items]
Redemption price, percentage	105.625%
July 1, 2022
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
11.25% Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount		$ 250,000,000
Senior notes maturity period		2,023
Debt instrument interest rate		11.25%	11.25%	11.25%
Debt instrument proceeds net		$ 244,400,000
Debt instrument maturity date	Jan. 1, 2023
Senior notes periodic payment terms	January 1 and July 1 of each year,
Senior notes beginning of first payment	Jul. 1, 2018
Senior notes redemption date	Jan. 1, 2021
Percentage of senior notes redeem from aggregate principal amount	65.00%
Redemption price, percentage	111.25%
Senior notes redemption description	11.25% Senior Notes originally issued remains outstanding immediately after such redemption and the redemption occurs within 180 days of the closing date of such equity offering.
11.25% Senior Notes | January 1, 2021
Debt Instrument [Line Items]
Percentage of senior notes redeem from aggregate principal amount	100.00%
11.25% Senior Notes | Maximum
Debt Instrument [Line Items]
Percentage of senior notes redeem from aggregate principal amount	35.00%
Senior notes redemption period	180 days
8.750% Senior Notes Due April 15, 2019
Debt Instrument [Line Items]
Debt instrument interest rate		8.75%	8.75%	8.75%
Payment of principal, interest and prepayment premium		$ 162,000,000

Long-Term Debt - Retirement of

Long-Term Debt - Retirement of 8.75% Senior Notes - Additional Information (Details) - USD ($) $ in Thousands	Jan. 04, 2018	Apr. 15, 2016	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt			$ 0		$ 0	$ (8,619)	$ 0
8.750% Senior Notes Due April 15, 2019
Debt Instrument [Line Items]
Debt instrument interest rate			8.75%			8.75%		8.75%	8.75%
8.750% Senior Notes Due April 15, 2019 | Unsecured Debt
Debt Instrument [Line Items]
Redemption price, percentage		104.375%
Redemption price, value		$ 158,500
Loss on extinguishment of debt				$ (8,600)
11.25% Senior Notes
Debt Instrument [Line Items]
Redemption price, percentage	111.25%
Debt instrument interest rate			11.25%			11.25%		11.25%	11.25%

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - $ / shares	Nov. 03, 2017	Jun. 15, 2017	Jun. 15, 2017	Jun. 30, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2018
Class of Stock [Line Items]
Minimum percentage of outstanding common stock beneficially own by approved holders				10.00%
Senior Unsecured Notes
Class of Stock [Line Items]
Unsecured notes, maturity period							2 years
Debt instrument interest rate							9.00%
Series A-1 Convertible Participating Preferred Stock
Class of Stock [Line Items]
Conversion of stock conversion rate							the Stated Value of such share divided by six
Conversion of stock, threshold trading days				20 days
Conversion of stock, threshold consecutive trading days				30 days
Threshold percentage of conversion price prior to June 15, 2019				200.00%
Threshold percentage of conversion price after June 15, 2019 but before June 15, 2020				175.00%
Threshold percentage of conversion price after June 15, 2020				150.00%
Preferred stock, dividend rate, percentage							20.00%
Stock conversion terms							the Company, at its option, may instead elect to exchange each share of Series A-1 Preferred Stock for senior unsecured notes of the Company with a two-year maturity, a 9.0% per annum coupon payable semi-annually in cash, and governed by terms substantially similar to the Company’s most recent high yield indenture at that time.
Payment-in-kind dividends (in shares)						1,991	3,821
Series A-1 Convertible Participating Preferred Stock | Battlecat and Marquis
Class of Stock [Line Items]
Number of shares issued				5,400
Preferred stock, par value (in dollars per share)				$ 0.001
Series A-2 Convertible Participating Preferred Stock
Class of Stock [Line Items]
Payment-in-kind dividends (in shares)					1,977
Series A-2 Convertible Participating Preferred Stock | Battlecat and Marquis
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share)				$ 0.001
Convertible participating preferred stock, number of shares issued				74,600
Series B Convertible Participating Preferred Stock
Class of Stock [Line Items]
Preferred stock to common stock conversion basis	one-for-one
Shares issued upon conversion	1
Series B Convertible Participating Preferred Stock | Battlecat Oil & Gas, LLC
Class of Stock [Line Items]
Number of shares issued in connection with acquisition		1,184,632	1,184,632
Series B Convertible Participating Preferred Stock | SN Marquis LLC
Class of Stock [Line Items]
Number of shares issued in connection with acquisition		1,500,000	1,500,000
Series A Preferred Stock
Class of Stock [Line Items]
Minimum percentage of outstanding preferred stock beneficially own by approved holders				15.00%
Preferred stock, dividend rate, percentage							9.00%
Shares issued, price per share							$ 975
Preferred stock, increase in dividend rate for next succeeding dividend period							5.00%
Preferred stock, additional increase in dividend rate for each successive dividend period							1.00%
Preferred stock redemption percentage							110.00%
Preferred stock redemption percentage							105.00%
Preferred stock redemption percentage							100.00%
Series A Preferred Stock | Maximum
Class of Stock [Line Items]
Preferred stock, dividend rate, percentage							20.00%
Class A Voting Common Stock
Class of Stock [Line Items]
Number of shares issued	2,684,632
Preferred stock to common stock conversion basis							one-for-one
Preferred stock, liquidation preference per share				$ 1,000

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended					3 Months Ended	6 Months Ended
	May 31, 2018	Apr. 30, 2018	Oct. 31, 2017	Aug. 31, 2017	Feb. 28, 2017	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expenses							$ 2.3	$ 2.7
Unrecognized stock-based compensation cost						$ 9.2	$ 9.2
Unrecognized stock-based compensation cost, recognition period							3 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting periods							3 years
Incremental modification cost						$ 0.2
Share-based compensation, liability paid							$ 1.1
Stock-based compensation expenses							$ 0.2
Restricted Stock Units (RSUs) | Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs or SARs granted (in shares)					612,000
Restricted Stock Units (RSUs) | Chairman of the Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs or SARs granted (in shares)	7,500	585,000		100,000
Restricted Stock Units (RSUs) | Internal General Counsel
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs or SARs granted (in shares)			28,409
Restricted Stock Units (RSUs) | Vesting on First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage							40.00%
Restricted Stock Units (RSUs) | Vesting on Second Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage							30.00%
Restricted Stock Units (RSUs) | Vesting on Third Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage							30.00%
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs or SARs granted (in shares)		335,000			700,000		335,000
Awards vesting periods					3 years
Share-based compensation, liability paid							$ 1.7
Share-based compensation expiration period					5 years
Stock Appreciation Rights (SARs) | Vesting on First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage					40.00%
Stock Appreciation Rights (SARs) | Vesting on Second Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage					30.00%
Stock Appreciation Rights (SARs) | Vesting on Third Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage					30.00%

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Outstanding Restricted Stock Units (Details) - Restricted Stock Units (RSUs) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Non-vested Shares [Roll Forward]
Non-vested RSUs at beginning of period (in shares)	728,909
Granted, Shares (in shares)	592,500
Vested (in shares)	(284,200)
Forfeited (in shares)	(7,500)
Non-vested RSUs at end of period (in shares)	1,029,709	728,909
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Non-vested RSUs, Weighted Average Remaining Contractual Term (in years)	2 years 3 months 18 days	2 years 2 months 12 days
Granted non-vested options, Weighted Average Remaining Contractual Term (in years)	2 years 9 months 18 days

Stock-Based Compensation - Sc_2

Stock-Based Compensation - Schedule of Outstanding Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) - $ / shares	1 Months Ended		6 Months Ended	12 Months Ended
	Apr. 30, 2018	Feb. 28, 2017	Jun. 30, 2018	Dec. 31, 2017
Outstanding Shares [Roll Forward]
Outstanding at beginning of period (in shares)			690,000
Granted (in shares)	335,000	700,000	335,000
Exercised (in shares)			0
Expired/forfeited (in shares)			(7,500)
Outstanding at end of period (in shares)			1,017,500	690,000
Options vested and exercisable (in shares)			280,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Outstanding at beginning of period, Weighted Average Exercise Price Per Share (in dollars per share)			$ 7.20
Granted, Weighted Average Exercise Price Per Share (in dollars per share)			4.46
Exercised, Weighted Average Exercise Price Per Share (in dollars per share)			0
Expired/forfeited , Weighted Average Exercise Price Per Share (in dollars per share)			0
Outstanding at end of period, Weighted Average Exercise Price Per Share (in dollars per share)			6.30	$ 7.20
Options vested and exercisable, Weighted Average Exercise Price Per Share (in dollars per share)			$ 7.20
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Non-vested RSUs, Weighted Average Remaining Contractual Term (in years)			4 years	4 years 3 months 18 days
Granted non-vested options, Weighted Average Remaining Contractual Term (in years)			4 years 9 months 18 days
Options vested and exercisable, Weighted Average Remaining Contractual Term (in years)			3 years 7 months 6 days

Related Party Activities - Addi

Related Party Activities - Additional Information (Details)	1 Months Ended		3 Months Ended		6 Months Ended
	Jan. 31, 2018USD ($)	Dec. 31, 2016USD ($)shares	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Oct. 26, 2016Director	Aug. 02, 2016USD ($)$ / sharesshares
Related Party Transaction [Line Items]
Registration rights agreement description					the Company entered into a Registration Rights Agreement with EF Realisation, pursuant to which the Company agreed to register for resale Class A voting common stock indirectly owned by EF Realisation. The Form S-3 registration statement was filed with the Securities and Exchange Commission on November 7, 2017 and is effective. The Company has also granted EF Realisation certain piggyback and demand registration rights.
Leucadia
Related Party Transaction [Line Items]
Offering fee recorded as reduction to additional paid-in capital	$ 1,000,000
Leucadia | Class A Voting Common Stock
Related Party Transaction [Line Items]
Number of common shares issued | shares		3,478,261
Common shares issued, Value		$ 20,000,000
Leucadia | Maximum | Class A Voting Common Stock
Related Party Transaction [Line Items]
Minimum ownership percentage required to appoint board of directors			50.00%		50.00%
Leucadia | Securities Purchase Agreement | 12% Senior Secured Second Lien Notes Due 2021
Related Party Transaction [Line Items]
Debt instrument interest rate								12.00%
Common stock price per share (in dollars per share) | $ / shares								$ 5
Leucadia | Securities Purchase Agreement | 12% Senior Secured Second Lien Notes Due 2021 | Maximum
Related Party Transaction [Line Items]
Debt instrument face amount								$ 49,900,000
Warrants to purchase common stock | shares								998,000
Juneau Energy, LLC | Securities Purchase Agreement
Related Party Transaction [Line Items]
Warrants to purchase common stock | shares		500,000
Juneau Energy, LLC | Securities Purchase Agreement | 12% Senior Secured Second Lien Notes Due 2021
Related Party Transaction [Line Items]
Sale of stock, description of transaction					(i) up to $49.9 million aggregate principal amount of LRAI’s 12% senior secured second lien notes due 2021 (“Second Lien Notes”) and (ii) five-year warrants to purchase up to an aggregate 998,000 shares of the Company’s Class A voting common stock at a price equal to $5.00 per share (the “Warrants”). During 2016, LRAI issued $25.0 million in aggregate principal amount of Second Lien Notes and the Company issued Warrants to purchase 500,000 shares of its Class A voting common stock to Juneau. In December 2016, LRAI repaid to Juneau $21.0 million principal of the Second Lien Notes.
Juneau Energy, LLC | Securities Purchase Agreement | Second Lien Notes
Related Party Transaction [Line Items]
Debt instrument face amount		$ 25,000,000
Repayment of principal second lien notes		$ 21,000,000
EF Realisation | Class A Voting Common Stock | Board Representation Agreement
Related Party Transaction [Line Items]
Minimum ownership percentage on common stock issued and outstanding required for nominating two directors							15.00%
Minimum ownership percentage on common stock issued and outstanding required for nominating one director							10.00%
EF Realisation | Maximum | Class A Voting Common Stock
Related Party Transaction [Line Items]
Number of directors to be nominated | Director							2
EF Realisation | Minimum | Class A Voting Common Stock
Related Party Transaction [Line Items]
Number of directors to be nominated | Director							1
New Tech Global Ventures, LLC
Related Party Transaction [Line Items]
Cost of consultancy services			$ 339,000	$ 156,000	$ 674,000	$ 388,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) $ in Thousands	1 Months Ended		6 Months Ended
	Mar. 29, 2018USD ($)	Feb. 28, 2018USD ($)	Jun. 30, 2018Well
Loss Contingencies [Line Items]
Number of wells being fractured | Well			3
Number of wells not hydraulically fractured as of termination date | Well			3
Drilling Rig
Loss Contingencies [Line Items]
Operating lease commencing month and year		2018-04
Aggregate drilling rate | $		$ 0
Drilling rig termination fee description		The early termination fee equals the greater of demobilization costs or $200 thousand, plus $200 thousand for each undrilled well.
Hydraulic Fracturing and Wireline Services
Loss Contingencies [Line Items]
Early termination fee amount | $	$ 133