Lonestar Resources US (LONE) 10-Q 12 Nov 19 2019 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 11, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	Lonestar Resources US Inc.
Entity Central Index Key	0001661920
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	true
Entity Small Business	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		24,944,891

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 3,441	$ 5,355
Accounts receivable
Oil, natural gas liquid and natural gas sales	16,594	15,103
Joint interest owners and others, net	5,159	4,541
Related parties	5,213	301
Derivative financial instruments	15,798	15,841
Prepaid expenses and other	2,844	1,966
Total current assets	49,049	43,107
Oil and gas properties, using the successful efforts method of accounting
Proved properties	1,009,545	960,711
Unproved properties	80,565	81,850
Other property and equipment	21,344	17,727
Less accumulated depreciation, depletion and amortization	(392,604)	(369,529)
Property and equipment, net	718,850	690,759
Derivative financial instruments	9,857	7,302
Other non-current assets	2,457	2,944
Total assets	780,213	744,112
Current liabilities
Accounts payable	34,363	18,260
Accounts payable – related parties	251	181
Oil, natural gas liquid and natural gas sales payable	15,286	13,022
Accrued liabilities	16,100	28,128
Derivative financial instruments	3,271	430
Total current liabilities	69,271	60,021
Long-term liabilities
Long-term debt	499,772	436,882
Asset retirement obligations	7,139	7,195
Deferred tax liabilities, net	5,387	12,370
Warrant liability	162	366
Warrant liability – related parties	299	689
Derivative financial instruments	4	21
Other non-current liabilities	3,360	4,021
Total long-term liabilities	516,123	461,544
Commitments and contingencies (Note 12)
Stockholders' Equity
Class A voting common stock, $0.001 par value, 100,000,000 shares authorized, 24,933,853 and 24,645,825 issued and outstanding, respectively	142,655	142,655
Series A-1 convertible participating preferred stock, $0.001 par value, 98,120 and 91,784 shares issued and outstanding, respectively	0	0
Additional paid-in capital	175,709	174,379
Accumulated deficit	(123,545)	(94,487)
Total stockholders' equity	194,819	222,547
Total liabilities and stockholders' equity	$ 780,213	$ 744,112

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	24,933,853	24,645,825
Common stock, shares outstanding (in shares)	24,933,853	24,645,825
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)	98,120	91,784
Preferred stock, shares outstanding (in shares)	98,120	91,784

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements Of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Revenues	$ 53,145	$ 58,737	$ 146,101	$ 143,281
Expenses
Lease operating and gas gathering	10,055	6,687	26,695	17,761
Production and ad valorem taxes	3,017	3,218	8,126	8,145
Depreciation, depletion and amortization	24,635	23,775	64,120	59,937
Loss on sale of oil and gas properties	483	0	33,530	1,568
Impairment of oil and gas properties	0	12,169	0	12,169
General and administrative	4,124	4,661	12,345	13,385
Acquisition costs and other	(2)	315	(4)	302
Total expenses	42,312	50,825	144,812	113,267
Income from operations	10,833	7,912	1,289	30,014
Other expense
Interest expense	(11,295)	(10,215)	(32,730)	(28,771)
Change in fair value of warrants	(100)	509	594	(2,105)
Gain (loss) on derivative financial instruments	21,546	(18,198)	(5,177)	(54,852)
Loss on extinguishment of debt	0	0	0	(8,619)
Total other expense	10,151	(27,904)	(37,313)	(94,347)
Income (loss) before income taxes	20,984	(19,992)	(36,024)	(64,333)
Income tax (expense) benefit	(4,767)	282	6,966	6,493
Net income (loss)	16,217	(19,710)	(29,058)	(57,840)
Preferred stock dividends	(2,159)	(1,975)	(6,336)	(5,796)
Net income (loss) attributable to common stockholders	$ 14,058	$ (21,685)	$ (35,394)	$ (63,636)
Net income (loss) per common share
Basic (in dollars per share)	$ 0.34	$ (0.88)	$ (1.42)	$ (2.59)
Diluted (in dollars per share)	$ 0.33	$ (0.88)	$ (1.42)	$ (2.59)
Weighted average common shares outstanding
Basic (in shares)	24,933,853	24,599,744	24,852,994	24,598,816
Diluted (in shares)	25,331,810	24,599,744	24,852,994	24,598,816
Oil sales
Revenues
Revenues	$ 42,187	$ 47,846	$ 120,496	$ 120,705
Natural gas liquid sales
Revenues
Revenues	3,439	6,795	10,381	12,939
Natural gas sales
Revenues
Revenues	$ 7,519	$ 4,096	$ 15,224	$ 9,637

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity - 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)			1,889
Issued pursuant to stock based compensation plan (in shares)		127,666
Issued pursuant to stock-based compensation plan	(610)			(610)
Stock-based compensation	216			216
Net income (loss)	(16,537)				(16,537)
Ending balance (in shares) at Mar. 31, 2018		24,634,313	85,857
Ending balance at Mar. 31, 2018	186,759	$ 142,655		174,477	(130,373)
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]
Net income (loss)	(57,840)
Ending balance (in shares) at Sep. 30, 2018		24,637,127	89,764
Ending balance at Sep. 30, 2018	145,438	$ 142,655		174,459	(171,676)
Beginning balance (in shares) at Mar. 31, 2018		24,634,313	85,857
Beginning balance at Mar. 31, 2018	186,759	$ 142,655		174,477	(130,373)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			1,932
Issued pursuant to stock based compensation plan (in shares)		2,814
Issued pursuant to stock-based compensation plan	(17)			(17)
Stock-based compensation	9			9
Net income (loss)	(21,593)				(21,593)
Ending balance (in shares) at Jun. 30, 2018		24,637,127	87,789
Ending balance at Jun. 30, 2018	165,158	$ 142,655		174,469	(151,966)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			1,975
Retirement of Class B Common Stock	(10)			(10)
Net income (loss)	(19,710)				(19,710)
Ending balance (in shares) at Sep. 30, 2018		24,637,127	89,764
Ending balance at Sep. 30, 2018	145,438	$ 142,655		174,459	(171,676)
Beginning balance (in shares) at Dec. 31, 2018		24,645,825	91,784
Beginning balance at Dec. 31, 2018	222,547	$ 142,655		174,379	(94,487)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			2,065
Issued pursuant to stock based compensation plan (in shares)		127,818
Issued pursuant to stock-based compensation plan	627			627
Net income (loss)	(58,564)				(58,564)
Ending balance (in shares) at Mar. 31, 2019		24,773,643	93,849
Ending balance at Mar. 31, 2019	164,610	$ 142,655		175,006	(153,051)
Beginning balance (in shares) at Dec. 31, 2018		24,645,825	91,784
Beginning balance at Dec. 31, 2018	222,547	$ 142,655		174,379	(94,487)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			6,336
Net income (loss)	(29,058)
Ending balance (in shares) at Sep. 30, 2019		24,933,853	98,120
Ending balance at Sep. 30, 2019	194,819	$ 142,655		175,709	(123,545)
Beginning balance (in shares) at Mar. 31, 2019		24,773,643	93,849
Beginning balance at Mar. 31, 2019	164,610	$ 142,655		175,006	(153,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			2,112
Issued pursuant to stock based compensation plan (in shares)		160,210
Issued pursuant to stock-based compensation plan	703			703
Net income (loss)	13,289				13,289
Ending balance (in shares) at Jun. 30, 2019		24,933,853	95,961
Ending balance at Jun. 30, 2019	178,602	$ 142,655		175,709	(139,762)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Payment-in-kind dividends (in shares)			2,159
Net income (loss)	16,217				16,217
Ending balance (in shares) at Sep. 30, 2019		24,933,853	98,120
Ending balance at Sep. 30, 2019	$ 194,819	$ 142,655		$ 175,709	$ (123,545)

Unaudited Condensed Consolida_5

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net loss	$ (29,058)	$ (57,840)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion and amortization	64,120	59,937
Stock-based compensation	1,294	3,637
Stock-based payments	0	(601)
Deferred taxes	(6,983)	(7,145)
Loss on derivative financial instruments	5,177	54,852
Settlements of derivative financial instruments	(3,858)	(16,323)
Impairment of oil and gas properties	0	12,169
Gain on disposal of property and equipment	(17)
Loss on abandoned property and equipment	0	171
Loss on sale of oil and gas properties	33,530
Non-cash interest expense	1,822	4,556
Change in fair value of warrants	(594)	2,105
Changes in operating assets and liabilities:
Accounts receivable	(8,330)	(4,596)
Prepaid expenses and other assets	(1,102)	(1,835)
Accounts payable and accrued expenses	(3,128)	6,733
Net cash provided by operating activities	52,873	55,820
Cash flows from investing activities
Acquisition of oil and gas properties	(5,239)	(4,762)
Development of oil and gas properties	(119,273)	(122,691)
Proceeds from sale of oil and gas properties	11,470
Purchases of other property and equipment	(3,527)	(1,631)
Net cash used in investing activities	(116,569)	(129,084)
Cash flows from financing activities
Proceeds from borrowings	114,000	348,744
Payments on borrowings	(52,218)	(273,466)
Repurchase and retire Class B Common Stock	0	(10)
Net cash provided by financing activities	61,782	75,268
Net (decrease) increase in cash and cash equivalents	(1,914)	2,004
Cash and cash equivalents, beginning of the period	5,355	2,538
Cash and cash equivalents, end of the period	3,441	4,542
Supplemental information:
Cash paid for taxes	0	1,147
Cash paid for interest	28,125	22,324
Non-cash investing and financing activities:
Change in asset retirement obligation	(292)	222
Change in liabilities for capital expenditures	$ 9,098	$ 16,988

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Organization and Nature of Operations Lonestar Resources US Inc. (“Lonestar” or the "Company") is a Delaware corporation whose common stock is listed and traded on the Nasdaq Global Select Market under the symbol “LONE”. Lonestar is an independent oil and natural gas company focused on the exploration, development and production of unconventional oil, natural gas liquids and natural gas in the Eagle Ford Shale play in South Texas. 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 for the year ended December 31, 2018 filed on March 13, 2019 (the “Form 10-K”). Unless indicated otherwise or the context requires, the terms “we,” “our,” “us,” “Company” or “Lonestar,” refer to Lonestar Resources US Inc. and its subsidiaries. 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 September 30, 2019 and our consolidated results of operations for the three and nine months ended September 30, 2019 and 2018 . Net Income (Loss) per Common Share The two-class method is utilized to compute earnings per common share as our Class A Participating Preferred Stock (the "Preferred Stock") is considered a participating security. Under the two-class method, losses are allocated only to those securities that have a contractual obligation to share in the losses of the Company. The Preferred Stock is not obligated to absorb Company losses and accordingly is not allocated losses. Net income attributable to common stockholders is allocated between common stock and participating securities based on the weighted average number of common shares and participating securities outstanding for the period. Basic earnings per share is computed by dividing the allocated net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period. Diluted earnings per share is computed similarly except that the denominator is increased to include dilutive potential common shares. Potential common shares consist of warrants, equity compensation awards and Preferred Stock. In certain circumstances adjustment to the numerator is also required for changes in income or loss resulting from the potential common shares. 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 earnings per share. The following is a reconciliation of basic and diluted earnings per share: In thousands, except shares and per-share data Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Numerator - Basic Net income (loss) attributable to common stockholders $ 14,058 $ (21,685 ) $ (35,394 ) $ (63,636 ) Less: allocation to participating securities (5,494 ) — — — Net income (loss) allocated to common stockholders - basic $ 8,564 $ (21,685 ) $ (35,394 ) $ (63,636 ) Numerator - Diluted Net income (loss) allocated to common stockholders - basic $ 8,564 $ (21,685 ) $ (35,394 ) $ (63,636 ) Restricted stock unit compensation gain, net of tax (80 ) — — — Net income (loss) allocated to common stockholders - diluted $ 8,484 $ (21,685 ) $ (35,394 ) $ (63,636 ) Denominator Weighted average number of common shares - basic 24,933,853 24,599,744 24,852,994 24,598,816 Restricted stock units converted under the treasury stock method 397,957 — — — Weighted average number of common shares - diluted 25,331,810 24,599,744 24,852,994 24,598,816 Earnings per share Basic $ 0.34 $ (0.88 ) $ (1.42 ) $ (2.59 ) Diluted $ 0.33 $ (0.88 ) $ (1.42 ) $ (2.59 ) The following weighted average securities could potentially dilute earnings per share for the periods indicated, but were excluded from the computation of diluted net income (loss) per share, as their effect would have been antidilutive: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Preferred stock 15,997,411 14,635,078 15,649,269 14,316,581 Warrants 760,000 760,000 760,000 760,000 Stock appreciation rights 1,010,000 1,017,500 1,010,000 901,108 Restricted stock units — 1,037,209 1,457,701 890,744 Recent Accounting Pronouncements Leases. In February 2016, the FASB issued Accounting Standards Update ("ASU") 2016-02, Leases ("ASU 2016-02"). The standard requires lessees to recognize a right of use asset ("ROU asset") and lease liability on the balance sheet for the rights and obligations created by leases. ASU 2016-02 also requires disclosures designed to give financial statement users information on the amount, timing, and uncertainty of cash flows arising from leases. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements ("ASU 2018-11"), which provides for an alternative transition method by allowing entities to initially apply the new leases standard at the adoption date, January 1, 2019, and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Comparative periods presented in the financial statements continue to be in accordance with ASC Topic 840, Leases . In the normal course of business, the Company enters into lease agreements to support its exploration and development operations and lease assets, such as drilling rigs, field services, well equipment, office space and other assets. The Company adopted the new standard on the effective date of January 1, 2019, using a modified retrospective approach as permitted under ASU 2018-11. The new standard provides a number of optional practical expedients in transition. The Company: • elected the package of 'practical expedients', which permits the Company not to reassess, under the new standard, its prior conclusions about lease identification, lease classification and initial direct costs; • elected the practical expedient pertaining to land easements and plan to account for existing land easements under the Company's current accounting policy; • elected the short-term lease recognition exemption for all leases that qualify and, as such, no ROU asset or lease liability has been recorded on the balance sheet and no transition adjustment has been required for short-term leases; and • elected the practical expedient to not separate lease and non-lease components for all of the Company's leases. The Company did not elect the hindsight practical expedient in determining the lease term and assessing impairment of ROU assets when transitioning to ASU 2016-02. Upon adoption, the Company recognized additional operating lease liabilities of approximately $0.3 million with corresponding ROU assets. See Note 4. Leases for more information.

Acquisitions and Divestitures

Acquisitions and Divestitures	9 Months Ended
	Sep. 30, 2019
Business Combinations [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures Pirate Divestiture On March 22, 2019, Lonestar completed the divestiture of its Pirate assets in Wilson County for $ 12.3 million, before closing adjustments, to a private third-party. The assets were comprised of 3,400 net undeveloped acres, six producing wells, held seven proved undeveloped locations as of the closing date, and were producing approximately 200 BOE/d. The Company recognized a loss of $ 33.5 million during the first quarter of 2019 in conjunction with the sale of the assets. Sooner Acquisition On November 15, 2018, Lonestar completed the acquisition of oil and gas properties in the Sugarkane Field in DeWitt County, Texas, for $ 38.7 million, before closing adjustments, from Sabine Oil & Gas Corporation and Alerion Gas AXA, LLC (the “Sooner Acquisition”). The acquisition was financed with funds available from our Credit Facility, as well as cash from operations. The Sooner Acquisition was accounted for as an asset acquisition applying the guidance of ASU 2017-01. As such, the properties were recorded based on the fair value of the total consideration transferred on the acquisition date, and all of the value of the transaction was allocated to proved oil and gas properties. Transaction costs of $ 0.3 million were capitalized as a component of the cost of the assets acquired. 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 $ 10.0 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 Acquisition Costs and 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. In February 2019, the Company acquired an adjacent property for $2.0 million . The property was acquired for future expansion.

Commodity Price Risk Activities

Commodity Price Risk Activities	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Commodity Price Risk Activities	Commodity Price Risk Activities Lonestar 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 entering into 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 Lonestar'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. As of September 30, 2019 , the Company had no open physical delivery obligations.The following table summarizes Lonestar's commodity derivative contracts as of September 30, 2019 : Contract Volumes Weighted Commodity Type Period Range (1) (Bbls/Mcf per day) Average Price Oil - WTI Swaps Oct - Dec 2019 $48.04 - $69.57 7,212 $ 54.54 Oil - Argus WTI (2) Basis Swaps Oct - Dec 2019 5.00 - 5.55 6,000 5.05 Oil - WTI Swaps Jan - Dec 2020 48.90 - 65.56 7,480 56.95 Oil - WTI Swaps Jan - Dec 2021 51.05 - 56.50 3,000 54.68 Natural Gas - Henry Hub Swaps Oct - Dec 2019 2.76 - 2.98 15,000 2.87 Natural Gas - Henry Hub Swaps Jan - Dec 2020 2.59 - 2.59 15,000 2.59 (1) Ranges presented for fixed-price swaps and basis swaps represent the lowest and highest fixed prices of all open contracts for the period presented. (2) Basis swap contracts establish a fixed amount for the differential between Argus WTI and Argus LLS prices on a trade-month basis for the period indicated. During October 2019, the Company entered into additional oil swaps for January through December of 2021, which hedge 365,000 bbls at $51.69 per bbl. During November 2019, the Company entered into additional natural gas swaps for January through December of 2021, which hedge 1,830,000 MMcf at an average price of $2.54 per Mcf. As of September 30, 2019 , 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.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	Leases Effective January 1, 2019, the Company adopted the new lease accounting standard (see Recent Accounting Pronouncements in Note 1. above) using the modified retrospective method of applying the new standard at the adoption date. Adoption of this standard resulted in the recording of net operating lease ROU assets and corresponding operating lease liabilities of $0.3 million . Leases for reporting periods beginning on or after January 1, 2019 are presented under the new guidance, while prior periods amounts are not adjusted and continue to be reported in accordance with previous guidance. Operating lease ROU assets are presented within Other Property and Equipment on the unaudited condensed consolidated balance sheet as of September 30, 2019 . The current portion of operating lease liabilities are presented within Accrued Liabilities, and the non-current portion of operating lease liabilities are presented within Other Non-Current Liabilities on the unaudited condensed consolidated balance sheet. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the Company's leases do not provide an implicit rate, the Company uses an incremental collateralized borrowing rate based on the information available at commencement date, including lease term, in determining the present value of future payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives and initial direct costs incurred. The Company's lease terms may include options to extend or terminate the lease when it is reasonably certain that the option will be exercised. Operating lease expense is recognized on a straight-line basis over the lease term. The Company's operating lease portfolio includes field equipment such as compressors and amine units, office space and office equipment. The Company currently does not have any financing leases. Our compressor and amine unit arrangements are typically structured with a non-cancelable primary term of one to two -years and continue thereafter on a month-to-month basis subject to termination by either party with thirty days notice. The Company's compressor and amine unit rental agreements represent operating leases with a lease term that equals the primary non-cancelable contract term. Upon completion of the primary term, both parties have substantive rights to terminate the lease. As a result, enforceable rights and obligations do not exist under the rental agreement subsequent to the primary term. The Company enters into daywork contracts for drilling rigs with third parties to support its drilling activities. The drilling rig arrangements are typically structured with a term that is in effect until drilling operations are completed on a contractually-specified well or well pad. Upon mutual agreement with the contractor, the Company typically has the option to extend the contract term for additional wells or well pads by providing thirty days notice prior to the end of the original contract term. Drilling rig arrangements represent short-term operating leases. The accounting guidance requires the Company to make an assessment at contract commencement if it is reasonably certain that it will exercise the option to extend the term. Due to the continuously evolving nature of the Company's drilling schedules and the potential volatility in commodity prices in an annual period, the Company's strategy to enter into shorter term drilling rig arrangements allows it the flexibility to respond to changes in our operating and economic environment. The Company exercises its discretion in choosing to extend or not extend contracts on a rig-by-rig basis depending on the conditions present at the time the contract expires. At the time of contract commencement, the Company has determined it cannot conclude with reasonable certainty if it will choose to extend the contract beyond its original term. Pursuant to the successful efforts method of accounting, these costs are capitalized as part of natural gas and oil properties on our balance sheet when paid. The Company leases a small part of the corporate building it owns a third-party, with a lease term that ends in 2023 and is non-cancelable. Third-party leasing income is insignificant and is included in Acquisition Costs and Other on the unaudited condensed consolidated statements of operations. The components of our total lease expense for the three and nine months ended September 30, 2019 are as follows: In thousands Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Operating Leases $ 68 $ 205 Short-term leases (1) 799 2,058 Total lease expense $ 867 $ 2,263 Short-term lease costs capitalized to oil and gas properties (2) $ 4,904 $ 9,827 (1) Short-term leases represent expenses related to leases with a contract term of one year or less. The majority of these leases relate to field operating equipment and are included in lease operating and gas gathering expense on the unaudited condensed consolidated statement of operations. (2) Short-term lease costs represent leases with a contract term of one year or less, the majority of which are related to drilling rigs and are capitalized as part of Oil and Gas Properties on the unaudited condensed consolidated balance sheets. Supplemental balance sheet information related to leases follows: In thousands, except lease term and discount rate data September 30, 2019 Operating leases Assets Other property and equipment $ 112 Liabilities Accrued liabilities $ 112 Weighted-average remaining lease term (years) 0.4 Weighted-average discount rate 5.0 % Supplemental cash flow information related to leases follows: In thousands Nine Months Ended September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 205 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 205 The table below reconciles the undiscounted cash flows for each of the first five years and total of the remaining years to the operating lease liabilities recorded on the unaudited condensed consolidated balance sheet as of September 30, 2019 : In thousands Operating Leases 2019 $ 68 2020 45 Thereafter — Total minimum lease payments 113 Amount of lease payments representing interest (1 ) Present value of future minimum lease payments $ 112 Under the previous accounting standard, future minimum lease payments for operating leases having initial or remaining noncancelable terms in excess of one year would have been as follows as of September 30, 2019 : In thousands Amount 2019 $ 174 2020 477 2021 368 Total minimum lease payments $ 1,019

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2019
Disaggregation of Revenue [Abstract]
Revenue Recognition	Revenue Recognition Operating revenues are comprised of sales of crude oil, NGLs and natural gas, as presented in the accompanying unaudited consolidated statements of operations for the three and nine months ended September 30, 2019 and 2018 . 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 based on a market index. Typically, the Company sells its products directly to customers generally under agreements with payment terms 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 Shale 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 Shale 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 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 September 30, 2019 . 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. 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. Any identified differences between its revenue estimates and actual revenue received historically have not been significant. For the nine months ended September 30, 2019 , 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 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 an allowance for uncollectible accounts is unnecessary. The Company’s operations do not result in any contract assets or liabilities on the accompanying consolidated balance sheets.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements 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. The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2019 and December 31, 2018 , 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 September 30, 2019 Assets Commodity derivatives $ — $ 25,655 $ — $ 25,655 Liabilities: Commodity derivatives — (3,275 ) — (3,275 ) Warrant — — (461 ) (461 ) Stock-based compensation (1,287 ) — (579 ) (1,866 ) Total $ (1,287 ) $ 22,380 $ (1,040 ) $ 20,053 December 31, 2018 Assets: Commodity derivatives $ — $ 23,143 $ — $ 23,143 Liabilities: Commodity derivatives — (451 ) — (451 ) Warrant — — (1,055 ) (1,055 ) Stock-based compensation (1,267 ) — (636 ) (1,903 ) Total $ (1,267 ) $ 22,692 $ (1,691 ) $ 19,734 Commodity Derivatives The Company's commodity derivatives represent non-exchange-traded oil and natural gas fixed-price swaps that are based on NYMEX pricing and fixed-price basis swaps that are based on regional pricing other than NYMEX (e.g., Louisiana Light Sweet). The asset and liability measurements for the Company's commodity derivative contracts represent Level 2 inputs in the hierarchy, as they are valued based on observable inputs other than quoted prices. Warrants The fair value of the Company's warrants is based on Black-Scholes valuations. In addition to the Company's observable stock price, other significant inputs are considered unobservable, and the Company has designated these estimates as Level 3. Stock-Based Compensation The Company's stock-based compensation includes the liability associated with restricted stock units ("RSUs") and stock appreciation rights ("SARs") dependent on the fair value of Lonestar's publicly-traded common stock. The fair value of RSUs is measured based on measurable prices on a major exchange; the significant inputs to these asset exchange values represented Level 1 independent active exchange market price inputs. The Black-Scholes model used to determine the fair value of the SARs uses inputs, in addition to the Company's observable stock price, that are considered unobservable; to this end the Company has designated these estimates as Level 3. See Note 10. Stock-Based Compensation , below for more information. 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 nine months ended September 30, 2019 : In thousands Warrant Stock-Based Compensation Total Balance as of December 31, 2018 $ (1,055 ) $ (636 ) $ (1,691 ) Unrealized gains 594 57 651 Balance as of September 30, 2019 $ (461 ) $ (579 ) $ (1,040 ) Assets and liabilities measured at fair value on a nonrecurring basis 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 debt or 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. Other fair value measurements The book values of cash and cash equivalents, accounts receivable and accounts payable, approximate fair value due to the short-term nature of these instruments. The carrying value of the Credit Facility (as defined in Note 8. below) approximates fair value since it is subject to a short-term floating interest rate that approximates the rate available to the Company. The fair value of the 11.25% Senior Notes (as defined in Note 8. below) was approximately $ 214.8 million as of September 30, 2019 and 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	9 Months Ended
	Sep. 30, 2019
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities Accrued liabilities consisted of the following as of the dates indicated: In thousands September 30, December 31, Bonus payable $ 1,744 $ 3,244 Payroll payable 51 773 Accrued interest – 11.25% Senior Notes 7,031 14,063 Accrued interest – other 478 104 Accrued well costs 3,074 9,026 Third party payments for joint interest expenditures 140 — Accrued severance, property and franchise taxes 2,356 96 Accrued federal income tax 439 441 Current portion of operating lease liability 112 — Other 675 381 Total accrued liabilities $ 16,100 $ 28,128

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt The following long-term debt obligations were outstanding as of the dates indicated: In thousands September 30, December 31, Senior Secured Credit Facility $ 245,000 $ 183,000 11.25% Senior Notes due 2023 250,000 250,000 Mortgage debt 8,959 9,151 Other 266 275 Total long-term debt 504,225 442,426 Unamortized discount (3,656 ) (4,500 ) Unamortized debt issuance costs (797 ) (1,044 ) Total long-term debt, net of debt issuance costs $ 499,772 $ 436,882 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 November 15, 2023 . As of September 30, 2019 , $245.0 million was borrowed under the Credit Facility, and the weighted average interest rate on borrowings under the Credit Facility for the quarter was 5.32% . Borrowing availability was $44.6 million as of September 30, 2019 , which reflects $0.4 million of letters of credit outstanding. 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. As of September 30, 2019 , the borrowing base and lender commitments for the Credit Facility was $ 290 million. The borrowing base under the Credit Facility is determined semi-annually as of May 1 and November 1 . As of November 11, 2019, the November 1 determination was ongoing and the prospective borrowing base amount had not been concluded upon with the lenders. In June 2019, the Company entered into the Borrowing Base Redetermination and Tenth Amendment to Credit Agreement (the "Tenth Amendment"), which (i) increased the borrowing base from $275 million to $290 million and (ii) amended certain other provisions of the Credit Facility, as set forth more specifically in the Tenth Amendment. The Company was in compliance with the terms of the Credit Facility as of September 30, 2019 . Issuance of 11.25% Senior Notes In January 2018, the Company issued $ 250 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 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 of each year . 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”) in January 2018. 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 excluded accrued interest. In connection with this transaction, the Company recognized a $8.6 million loss on extinguishment during the first quarter of 2018. Debt Issuance Costs The Company capitalizes certain direct costs associated with the issuance of long-term debt and amortizes such costs over the lives of the respective debt. At September 30, 2019 and December 31, 2018 , the Company had approximately $ 1.0 million and $ 1.7 million, respectively, of debt issuance costs associated with issuance of the Credit Facility remaining that are being amortized over the lives of the respective debt which are recorded as Other Non-Current Assets in the accompanying unaudited condensed consolidated balance sheets.

Stockholders_ Equity

Stockholders’ Equity	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Stockholders’ Equity	Stockholders’ Equity Series A & B Preferred Stock In June 2017, the Company closed on acquisitions with Battlecat Oil & Gas, LLC ("Battlecat") and SN Marquis LLC ("Marquis"). 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. As a result of the stockholder approval obtained in November 2017, 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) 175%, if such mandatory conversion occurs before June 15, 2020 and (ii) 150%, if such mandatory conversion occurs after June 15, 2020. Holders of Series A-1 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-1 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 (three of which remain as of September 30, 2019), 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% per annum for the next succeeding dividend period and then an additional 1% for each successive dividend period, up to a maximum Dividend Rate of 20% 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-1 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% 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% 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-1 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 on or 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 and all four quarters of 2018, the Company elected the PIK Option for the Class A-1 Preferred Stock dividend payment, which resulted in the issuance of 11,784 additional shares of Series A-1 Preferred Stock. For the first three quarters of 2019, the Company also elected the PIK Option for the Class A-1 Preferred Stock dividend payment, which resulted in the issuance of 6,336 additional shares of Series A-1 Preferred Stock. Repurchase and Retirement of Class B Common Stock In connection with the EF Realisation liquidation in October 2018, the Company repurchased and retired 2,500 shares of the Class B non-voting common stock (the "Class B Stock") from Dr. Christopher Rowland at a cost of $ 10,000 on September 28, 2018 . The Class B Stock was originally issued to Dr. Rowland in connection with the Company's reorganization in 2016. After the repurchase and retirement of the Class B Stock, there are no shares of Class B Stock issued and outstanding.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Restricted Stock Units Lonestar grants awards of restricted stock units ("RSUs") to employees and directors as part of its long-term compensation program. The awards vest over a three-year period, with specific terms of vesting determined at the time of grant. 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 (see below) after the vesting of the applicable RSU. Compensation expense for granted RSUs is recognized over the vesting period. For the nine months ended September 30, 2019 and 2018 , the Company recognized $ 2.0 million and $ 2.1 million, respectively, of stock-based compensation expense for RSUs. During the first quarter of 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 September 30, 2019 and December 31, 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 liability for RSUs on the accompanying consolidated balance sheet as of September 30, 2019 was $ 1.3 million. As of September 30, 2019 , there was $ 3.7 million of unrecognized compensation expense related to non-vested RSU grants. This unrecognized compensation cost is expected to be recognized over a weighted-average period of 2.1 years. No RSUs vested during the three months ended September 30, 2019. A summary of the status of the Company's non-vested RSU grants issued, and the changes during the nine months ended September 30, 2019 is presented below: Shares Weighted Average Fair Value per Share Non-vested RSUs at December 31, 2018 1,011,045 $ 5.06 Granted 1,274,750 3.42 Vested (434,900 ) 4.64 Forfeited (3,450 ) — Non-vested RSUs at September 30, 2019 1,847,445 $ 4.04 Stock Appreciation Rights In the past, Lonestar has granted awards of stock appreciation rights (“SARs”) to employees and directors as part its long-term compensation program. The awards vest over a three-year period, with specific terms of vesting determined at the time of grant, and expire five-years after the date of issuance. The SARs are granted with a strike price equal to the fair market value at the time of grant, which erally defined as the closing price of the Company's common stock on the NASDAQ on the date of grant. SARs will be paid in cash or common stock at holder’s election once the SAR is vested. For the nine months ended September 30, 2019 and 2018 , the Company recognized $ (0.1) million and $ 1.5 million, respectively, of stock-based compensation (benefit) expense for SARs. The liability for SARs on the accompanying unaudited consolidated balance sheet as of September 30, 2019 was approximately $ 0.6 million. As of September 30, 2019 , there was $ 0.2 million of total compensation cost to be recognized in future periods related to non-vested SAR grants. The cost is expected to be recognized over a weighted-average period of 1.0 year. The following is a summary of the Company's SAR activity: Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in years) Outstanding at December 31, 2018 1,010,000 $ 6.30 3.5 SARs vested and exercisable at December 31, 2018 280,000 7.20 3.2 Granted — — — Exercised — — — Expired/forfeited — — — Outstanding at September 30, 2019 1,010,000 $ 6.30 2.8 SARs vested and exercisable at September 30, 2019 606,250 $ 6.65 2.7

Related Party Activities

Related Party Activities	9 Months Ended
	Sep. 30, 2019
Related Party Transactions [Abstract]
Related Party Activities	Related Party Activities Leucadia In August 2016, Lonestar 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 the Company'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, the Company's 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, Lonestar 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. On October 9, 2018, EF Realisation notified the Company that it had completed a voluntary liquidation and distribution of assets to certain of its shareholders, including the sale or distribution of all of EF Realisation's 4,174,259 shares of the Company's Class A Stock, representing approximately 17% of the Company's total Class A Stock outstanding at the time. Following the liquidation, EF Realisation is no longer a shareholder of the Company. Amendment of Registration Rights Agreement In connection with the Battlecat and Marquis acquisitions, in June 2017, Lonestar 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, and New Tech Global Environmental, LLC, companies in which a director of the Company owns a limited partnership interest, have provided field engineering staff and consultancy services for the Company since 2013. The total cost for such services was approximately $ 0.5 million and $ 0.6 million for the three months ended September 30, 2019 and 2018 , respectively, and $ 1.3 million and $ 1.4 million for the nine months ended September 30, 2019 and 2018, respectively. In February 2019, the Company purchased a property adjacent to its corporate office for future expansion for approximately $2.0 million. The transaction was funded with cash from operations. The seller of the property is indebted to certain trusts established in favor of the children of one of the Company's directors. The Company understands that the seller may use some of the proceeds of the sale to satisfy such outstanding indebtedness, though the Company has no interest or influence over any particular outcome.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lonestar has one drilling rig under contract that is currently operating, which provides for a drilling rate of $22.5 thousand per day, and expires on March 22, 2020. Should the Company terminate the contract early, the early termination fee totals $15.0 thousand per day times the remaining number of days left on the contract after the termination date. In November 2018, the Company signed a dedicated fleet contract that provides for hydraulic fracturing and wireline services at variable rates depending on the work performed. As amended, the contract provides for services for any wells the Company completes and expires on December 31, 2020 with no provisions for early termination. From time to time, Lonestar is subject to legal proceedings and claims that arise in the ordinary course of business. Like other crude oil and gas producers and marketers, the Company's operations are subject to extensive and rapidly changing federal and state environmental, health and safety, and other laws and regulations governing air emissions, wastewater discharges and solid and hazardous waste management activities. The Company is not aware of any pending or overtly threatened legal action against it that could have a material impact on its business.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events None.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2019
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 for the year ended December 31, 2018 filed on March 13, 2019 (the “Form 10-K”). Unless indicated otherwise or the context requires, the terms “we,” “our,” “us,” “Company” or “Lonestar,” refer to Lonestar Resources US Inc. and its subsidiaries. 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 September 30, 2019 and our consolidated results of operations for the three and nine months ended September 30, 2019 and 2018 .
Net Income (Loss) per Common Share	Net Income (Loss) per Common Share The two-class method is utilized to compute earnings per common share as our Class A Participating Preferred Stock (the "Preferred Stock") is considered a participating security. Under the two-class method, losses are allocated only to those securities that have a contractual obligation to share in the losses of the Company. The Preferred Stock is not obligated to absorb Company losses and accordingly is not allocated losses. Net income attributable to common stockholders is allocated between common stock and participating securities based on the weighted average number of common shares and participating securities outstanding for the period. Basic earnings per share is computed by dividing the allocated net income (loss) attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period. Diluted earnings per share is computed similarly except that the denominator is increased to include dilutive potential common shares. Potential common shares consist of warrants, equity compensation awards and Preferred Stock. In certain circumstances adjustment to the numerator is also required for changes in income or loss resulting from the potential common shares. 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 earnings per share.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Leases. In February 2016, the FASB issued Accounting Standards Update ("ASU") 2016-02, Leases ("ASU 2016-02"). The standard requires lessees to recognize a right of use asset ("ROU asset") and lease liability on the balance sheet for the rights and obligations created by leases. ASU 2016-02 also requires disclosures designed to give financial statement users information on the amount, timing, and uncertainty of cash flows arising from leases. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements ("ASU 2018-11"), which provides for an alternative transition method by allowing entities to initially apply the new leases standard at the adoption date, January 1, 2019, and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Comparative periods presented in the financial statements continue to be in accordance with ASC Topic 840, Leases . In the normal course of business, the Company enters into lease agreements to support its exploration and development operations and lease assets, such as drilling rigs, field services, well equipment, office space and other assets. The Company adopted the new standard on the effective date of January 1, 2019, using a modified retrospective approach as permitted under ASU 2018-11. The new standard provides a number of optional practical expedients in transition. The Company: • elected the package of 'practical expedients', which permits the Company not to reassess, under the new standard, its prior conclusions about lease identification, lease classification and initial direct costs; • elected the practical expedient pertaining to land easements and plan to account for existing land easements under the Company's current accounting policy; • elected the short-term lease recognition exemption for all leases that qualify and, as such, no ROU asset or lease liability has been recorded on the balance sheet and no transition adjustment has been required for short-term leases; and • elected the practical expedient to not separate lease and non-lease components for all of the Company's leases. The Company did not elect the hindsight practical expedient in determining the lease term and assessing impairment of ROU assets when transitioning to ASU 2016-02. Upon adoption, the Company recognized additional operating lease liabilities of approximately $0.3 million with corresponding ROU assets. See Note 4. Leases for more information.
Fair Value Measurements	Fair Value Measurements 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. The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis as of September 30, 2019 and December 31, 2018 , 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 September 30, 2019 Assets Commodity derivatives $ — $ 25,655 $ — $ 25,655 Liabilities: Commodity derivatives — (3,275 ) — (3,275 ) Warrant — — (461 ) (461 ) Stock-based compensation (1,287 ) — (579 ) (1,866 ) Total $ (1,287 ) $ 22,380 $ (1,040 ) $ 20,053 December 31, 2018 Assets: Commodity derivatives $ — $ 23,143 $ — $ 23,143 Liabilities: Commodity derivatives — (451 ) — (451 ) Warrant — — (1,055 ) (1,055 ) Stock-based compensation (1,267 ) — (636 ) (1,903 ) Total $ (1,267 ) $ 22,692 $ (1,691 ) $ 19,734 Commodity Derivatives The Company's commodity derivatives represent non-exchange-traded oil and natural gas fixed-price swaps that are based on NYMEX pricing and fixed-price basis swaps that are based on regional pricing other than NYMEX (e.g., Louisiana Light Sweet). The asset and liability measurements for the Company's commodity derivative contracts represent Level 2 inputs in the hierarchy, as they are valued based on observable inputs other than quoted prices. Warrants The fair value of the Company's warrants is based on Black-Scholes valuations. In addition to the Company's observable stock price, other significant inputs are considered unobservable, and the Company has designated these estimates as Level 3. Stock-Based Compensation The Company's stock-based compensation includes the liability associated with restricted stock units ("RSUs") and stock appreciation rights ("SARs") dependent on the fair value of Lonestar's publicly-traded common stock. The fair value of RSUs is measured based on measurable prices on a major exchange; the significant inputs to these asset exchange values represented Level 1 independent active exchange market price inputs. The Black-Scholes model used to determine the fair value of the SARs uses inputs, in addition to the Company's observable stock price, that are considered unobservable; to this end the Company has designated these estimates as Level 3. See Note 10. Stock-Based Compensation , below for more information. 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 nine months ended September 30, 2019 : In thousands Warrant Stock-Based Compensation Total Balance as of December 31, 2018 $ (1,055 ) $ (636 ) $ (1,691 ) Unrealized gains 594 57 651 Balance as of September 30, 2019 $ (461 ) $ (579 ) $ (1,040 ) Assets and liabilities measured at fair value on a nonrecurring basis 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 debt or 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. Other fair value measurements The book values of cash and cash equivalents, accounts receivable and accounts payable, approximate fair value due to the short-term nature of these instruments. The carrying value of the Credit Facility (as defined in Note 8. below) approximates fair value since it is subject to a short-term floating interest rate that approximates the rate available to the Company. The fair value of the 11.25% Senior Notes (as defined in Note 8. below) was approximately $ 214.8 million as of September 30, 2019 and are considered a Level 3 liability, as they are based on market transactions that occur infrequently as well as internally generated inputs.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following is a reconciliation of basic and diluted earnings per share: In thousands, except shares and per-share data Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Numerator - Basic Net income (loss) attributable to common stockholders $ 14,058 $ (21,685 ) $ (35,394 ) $ (63,636 ) Less: allocation to participating securities (5,494 ) — — — Net income (loss) allocated to common stockholders - basic $ 8,564 $ (21,685 ) $ (35,394 ) $ (63,636 ) Numerator - Diluted Net income (loss) allocated to common stockholders - basic $ 8,564 $ (21,685 ) $ (35,394 ) $ (63,636 ) Restricted stock unit compensation gain, net of tax (80 ) — — — Net income (loss) allocated to common stockholders - diluted $ 8,484 $ (21,685 ) $ (35,394 ) $ (63,636 ) Denominator Weighted average number of common shares - basic 24,933,853 24,599,744 24,852,994 24,598,816 Restricted stock units converted under the treasury stock method 397,957 — — — Weighted average number of common shares - diluted 25,331,810 24,599,744 24,852,994 24,598,816 Earnings per share Basic $ 0.34 $ (0.88 ) $ (1.42 ) $ (2.59 ) Diluted $ 0.33 $ (0.88 ) $ (1.42 ) $ (2.59 )
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 weighted average securities could potentially dilute earnings per share for the periods indicated, but were excluded from the computation of diluted net income (loss) per share, as their effect would have been antidilutive: Three Months Ended September 30, Nine Months Ended September 30, 2019 2018 2019 2018 Preferred stock 15,997,411 14,635,078 15,649,269 14,316,581 Warrants 760,000 760,000 760,000 760,000 Stock appreciation rights 1,010,000 1,017,500 1,010,000 901,108 Restricted stock units — 1,037,209 1,457,701 890,744

Commodity Price Risk Activiti_2

Commodity Price Risk Activities (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Commodity Derivative Contracts	The following table summarizes Lonestar's commodity derivative contracts as of September 30, 2019 : Contract Volumes Weighted Commodity Type Period Range (1) (Bbls/Mcf per day) Average Price Oil - WTI Swaps Oct - Dec 2019 $48.04 - $69.57 7,212 $ 54.54 Oil - Argus WTI (2) Basis Swaps Oct - Dec 2019 5.00 - 5.55 6,000 5.05 Oil - WTI Swaps Jan - Dec 2020 48.90 - 65.56 7,480 56.95 Oil - WTI Swaps Jan - Dec 2021 51.05 - 56.50 3,000 54.68 Natural Gas - Henry Hub Swaps Oct - Dec 2019 2.76 - 2.98 15,000 2.87 Natural Gas - Henry Hub Swaps Jan - Dec 2020 2.59 - 2.59 15,000 2.59 (1) Ranges presented for fixed-price swaps and basis swaps represent the lowest and highest fixed prices of all open contracts for the period presented. (2) Basis swap contracts establish a fixed amount for the differential between Argus WTI and Argus LLS prices on a trade-month basis for the period indicated.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Components of Lease Expense and Supplemental Cash Flow Information	Supplemental cash flow information related to leases follows: In thousands Nine Months Ended September 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 205 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 205 The components of our total lease expense for the three and nine months ended September 30, 2019 are as follows: In thousands Three Months Ended September 30, 2019 Nine Months Ended September 30, 2019 Operating Leases $ 68 $ 205 Short-term leases (1) 799 2,058 Total lease expense $ 867 $ 2,263 Short-term lease costs capitalized to oil and gas properties (2) $ 4,904 $ 9,827 (1) Short-term leases represent expenses related to leases with a contract term of one year or less. The majority of these leases relate to field operating equipment and are included in lease operating and gas gathering expense on the unaudited condensed consolidated statement of operations. (2) Short-term lease costs represent leases with a contract term of one year or less, the majority of which are related to drilling rigs and are capitalized as part of Oil and Gas Properties on the unaudited condensed consolidated balance sheets.
Supplemental Balance Sheet Information	Supplemental balance sheet information related to leases follows: In thousands, except lease term and discount rate data September 30, 2019 Operating leases Assets Other property and equipment $ 112 Liabilities Accrued liabilities $ 112 Weighted-average remaining lease term (years) 0.4 Weighted-average discount rate 5.0 %
Maturities of Operating Lease Liabilities	The table below reconciles the undiscounted cash flows for each of the first five years and total of the remaining years to the operating lease liabilities recorded on the unaudited condensed consolidated balance sheet as of September 30, 2019 : In thousands Operating Leases 2019 $ 68 2020 45 Thereafter — Total minimum lease payments 113 Amount of lease payments representing interest (1 ) Present value of future minimum lease payments $ 112
Maturities of Operating Leases Under Previous Accounting Standard	Under the previous accounting standard, future minimum lease payments for operating leases having initial or remaining noncancelable terms in excess of one year would have been as follows as of September 30, 2019 : In thousands Amount 2019 $ 174 2020 477 2021 368 Total minimum lease payments $ 1,019

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
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 September 30, 2019 and December 31, 2018 , 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 September 30, 2019 Assets Commodity derivatives $ — $ 25,655 $ — $ 25,655 Liabilities: Commodity derivatives — (3,275 ) — (3,275 ) Warrant — — (461 ) (461 ) Stock-based compensation (1,287 ) — (579 ) (1,866 ) Total $ (1,287 ) $ 22,380 $ (1,040 ) $ 20,053 December 31, 2018 Assets: Commodity derivatives $ — $ 23,143 $ — $ 23,143 Liabilities: Commodity derivatives — (451 ) — (451 ) Warrant — — (1,055 ) (1,055 ) Stock-based compensation (1,267 ) — (636 ) (1,903 ) Total $ (1,267 ) $ 22,692 $ (1,691 ) $ 19,734
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 nine months ended September 30, 2019 : In thousands Warrant Stock-Based Compensation Total Balance as of December 31, 2018 $ (1,055 ) $ (636 ) $ (1,691 ) Unrealized gains 594 57 651 Balance as of September 30, 2019 $ (461 ) $ (579 ) $ (1,040 )

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	9 Months Ended
	Sep. 30, 2019
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following as of the dates indicated: In thousands September 30, December 31, Bonus payable $ 1,744 $ 3,244 Payroll payable 51 773 Accrued interest – 11.25% Senior Notes 7,031 14,063 Accrued interest – other 478 104 Accrued well costs 3,074 9,026 Third party payments for joint interest expenditures 140 — Accrued severance, property and franchise taxes 2,356 96 Accrued federal income tax 439 441 Current portion of operating lease liability 112 — Other 675 381 Total accrued liabilities $ 16,100 $ 28,128

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of Long-Term Debt Outstanding	The following long-term debt obligations were outstanding as of the dates indicated: In thousands September 30, December 31, Senior Secured Credit Facility $ 245,000 $ 183,000 11.25% Senior Notes due 2023 250,000 250,000 Mortgage debt 8,959 9,151 Other 266 275 Total long-term debt 504,225 442,426 Unamortized discount (3,656 ) (4,500 ) Unamortized debt issuance costs (797 ) (1,044 ) Total long-term debt, net of debt issuance costs $ 499,772 $ 436,882

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Outstanding Restricted Stock Units	A summary of the status of the Company's non-vested RSU grants issued, and the changes during the nine months ended September 30, 2019 is presented below: Shares Weighted Average Fair Value per Share Non-vested RSUs at December 31, 2018 1,011,045 $ 5.06 Granted 1,274,750 3.42 Vested (434,900 ) 4.64 Forfeited (3,450 ) — Non-vested RSUs at September 30, 2019 1,847,445 $ 4.04
Schedule of Outstanding Stock Appreciation Rights	The following is a summary of the Company's SAR activity: Shares Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in years) Outstanding at December 31, 2018 1,010,000 $ 6.30 3.5 SARs vested and exercisable at December 31, 2018 280,000 7.20 3.2 Granted — — — Exercised — — — Expired/forfeited — — — Outstanding at September 30, 2019 1,010,000 $ 6.30 2.8 SARs vested and exercisable at September 30, 2019 606,250 $ 6.65 2.7

Basis of Presentation - Reconci

Basis of Presentation - Reconciliation of Basic and Diluted Earnings per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator - Basic
Net income (loss) attributable to common stockholders	$ 14,058,000	$ (21,685,000)	$ (35,394,000)	$ (63,636,000)
Less: allocation to participating securities	(5,494,000)	0	0	0
Net income (loss) allocated to common stockholders - basic	8,564,000	(21,685,000)	(35,394,000)	(63,636,000)
Numerator - Diluted
Net income (loss) allocated to common stockholders - basic	8,564,000	(21,685,000)	(35,394,000)	(63,636,000)
Restricted stock unit compensation gain, net of tax	(80,000)	0	0	0
Net income (loss) allocated to common stockholders - diluted	$ 8,484,000	$ (21,685,000)	$ (35,394,000)	$ (63,636,000)
Denominator
Weighted average number of common shares - basic (in shares)	24,933,853	24,599,744	24,852,994	24,598,816
Restricted stock units converted under the treasury stock method (in shares)	397,957	0	0	0
Weighted average number of common shares - diluted (in shares)	25,331,810	24,599,744	24,852,994	24,598,816
Earnings per share
Basic (in dollars per share)	$ 0.34	$ (0.88)	$ (1.42)	$ (2.59)
Diluted (in dollars per share)	$ 0.33	$ (0.88)	$ (1.42)	$ (2.59)

Basis of Presentation - Schedul

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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	15,997,411	14,635,078	15,649,269	14,316,581
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)	1,010,000	1,017,500	1,010,000	901,108
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)	0	1,037,209	1,457,701	890,744

Basis of Presentation Basis of

Basis of Presentation Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability	$ 112
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset		$ 300
Operating lease, liability		$ 300

Acquisitions and Divestitures A

Acquisitions and Divestitures Acquisitions and Divestitures - Divestiture (Details) $ in Thousands	Mar. 22, 2019USD ($)aBoewelllocation	Sep. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on divestiture		$ (483)		$ 0	$ (33,530)	$ (1,568)
Pirate Divestiture
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture	$ 12,300
Net undeveloped acres (in acres) | a	3,400
Producing wells | well	6
Proved undeveloped locations | location	7
Production per day (in barrels of oil equivalent) | Boe	200
Gain (loss) on divestiture			$ (33,500)

Acquisitions and Divestitures -

Acquisitions and Divestitures - Acquisitions (Details) - USD ($) $ in Millions	Nov. 15, 2018	Aug. 02, 2017	Mar. 31, 2018	Feb. 28, 2019
Business Acquisition [Line Items]
Acquisition price of an office building		$ 10
Acquisition of property for future expansion				$ 2
Texas | Other Expense
Business Acquisition [Line Items]
Impairment charge			$ 1.6
Sooner Acquisition
Business Acquisition [Line Items]
Purchase consideration of oil and gas properties	$ 38.7
Transaction costs capitalized	$ 0.3

Commodity Price Risk Activiti_3

Commodity Price Risk Activities - Additional Information (Details)	Nov. 12, 2019$ / bblMcf	Oct. 31, 2019$ / bblbbl	Sep. 30, 2019deliveryobligation
Derivative [Line Items]
Number of open physical obligations | deliveryobligation			0
Subsequent Event | Oil - WTI Swaps January - December 2021
Derivative [Line Items]
Total volume | bbl		365,000
Weighted average price - swap		51.69
Subsequent Event | Natural Gas - Swaps January - December 2021
Derivative [Line Items]
Total volume | Mcf	1,830,000
Weighted average price - swap	2.54

Commodity Price Risk Activiti_4

Commodity Price Risk Activities - Schedule of Commodity Derivative Contracts (Details)	9 Months Ended
	Sep. 30, 2019$ / MMBTU$ / bblbblMcf
Oil - WTI Swaps October - December 2019
Derivative [Line Items]
Total volume | bbl	7,212
Weighted average price - swap	54.54
Weighted average price - floor	48.04
Weighted average price - ceiling	69.57
Oil Argus WTI Basic Swaps October - December 2019
Derivative [Line Items]
Total volume | bbl	6,000
Weighted average price - swap	5.05
Weighted average price - floor	5
Weighted average price - ceiling	5.55
Oil -WTI Swaps January-December 2020
Derivative [Line Items]
Total volume | bbl	7,480
Weighted average price - swap	56.95
Weighted average price - floor	48.90
Weighted average price - ceiling	65.56
Oil - WTI Swaps January - December 2021
Derivative [Line Items]
Total volume | bbl	3,000
Weighted average price - swap	54.68
Weighted average price - floor	51.05
Weighted average price - ceiling	56.50
Natural Gas - Henry Hub Swaps October - December 2019
Derivative [Line Items]
Total volume | Mcf	15,000
Weighted average price - swap	2.87
Weighted average price - floor | $ / MMBTU	2.76
Weighted average price - ceiling | $ / MMBTU	2.98
Natural Gas - Henry Hub Swaps January - December 2020
Derivative [Line Items]
Total volume | Mcf	15,000
Weighted average price - swap	2.59
Weighted average price - floor | $ / MMBTU	2.59
Weighted average price - ceiling | $ / MMBTU	2.59

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 112
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease, liability		$ 300
Right-of-use asset		$ 300
Minimum
Lessee, Lease, Description [Line Items]
Non-cancelable primary lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Non-cancelable primary lease term	2 years

Leases - Components of Lease Ex

Leases - Components of Lease Expense and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating Leases	$ 68	$ 205
Short-term leases	799	2,058
Total lease expense	867	2,263
Short-Term lease costs	$ 4,904	9,827
Cash paid for amounts included in the measurement of lease liabilities		205
Right-of-use assets obtained in exchange for operating lease obligations		$ 205

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) $ in Thousands	Sep. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 112
Weighted-average remaining lease term (years)	4 months 24 days
Weighted-average discount rate	5.00%
Other property and equipment
Lessee, Lease, Description [Line Items]
Right-of-use asset	$ 112
Accrued liabilities
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 112

Leases - Maturities of Operatin

Leases - Maturities of Operating Lease Liabilities (Details)	Sep. 30, 2019USD ($)
Leases [Abstract]
2019	$ 68,000
2020	45,000
Thereafter	0
Total minimum lease payments	113,000
Amount of lease payments representing interest	(1,000)
Present value of future minimum lease payments	$ 112,000

Leases - Maturities of Operat_2

Leases - Maturities of Operating Leases Under Previous Accounting Standard (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
2019	$ 174
2020	477
2021	368
Total minimum lease payments	$ 1,019

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Disaggregation of Revenue [Abstract]
Bad debt expense	$ 0	$ 0
Allowance for uncollectible accounts	$ 0	$ 0	$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant	$ (461)	$ (1,055)
Stock-based compensation	(1,866)	(1,903)
Total	20,053	19,734
Commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	25,655	23,143
Commodity derivatives	(3,275)	(451)
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant	0	0
Stock-based compensation	(1,287)	(1,267)
Total	(1,287)	(1,267)
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
Commodity derivatives	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant	0	0
Stock-based compensation	0	0
Total	22,380	22,692
Significant Other Observable Inputs (Level 2) | Commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	25,655	23,143
Commodity derivatives	(3,275)	(451)
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant	(461)	(1,055)
Stock-based compensation	(579)	(636)
Total	(1,040)	(1,691)
Significant Unobservable Inputs (Level 3) | Commodity derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Commodity derivatives	$ 0	$ 0

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Changes in Fair Value for the Level 3 Liability (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ (1,691)
Unrealized gains	651
Ending balance	(1,040)
Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(1,055)
Unrealized gains	594
Ending balance	(461)
Stock-Based Compensation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(636)
Unrealized gains	57
Ending balance	$ (579)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 31, 2018
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)	11.25%
11.25% Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)	11.25%	11.25%
Fair value of senior notes	$ 214.8

Accrued Liabilities - Schedule

Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Bonus payable	$ 1,744	$ 3,244
Payroll payable	51	773
Accrued interest – 11.25% Senior Notes	7,031	14,063
Accrued interest – other	478	104
Accrued well costs	3,074	9,026
Third party payments for joint interest expenditures	140	0
Accrued severance, property and franchise taxes	2,356	96
Accrued federal income tax	439	441
Current portion of operating lease liability	112	0
Other	675	381
Total accrued liabilities	$ 16,100	$ 28,128
Debt instrument interest rate (as a percent)	11.25%

Long-Term Debt - Schedule of Lo

Long-Term Debt - Schedule of Long-Term Debt Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Senior Secured Credit Facility	$ 245,000	$ 183,000
Other	266	275
Total long-term debt	504,225	442,426
Unamortized discount	(3,656)	(4,500)
Unamortized debt issuance costs	(797)	(1,044)
Total long-term debt, net of debt issuance costs	499,772	436,882
Mortgages Debt
Debt Instrument [Line Items]
Mortgage debt	8,959	9,151
11.25% Senior Notes
Debt Instrument [Line Items]
11.25% Senior Notes due 2023	$ 250,000	$ 250,000

Long-Term Debt - Senior Secured

Long-Term Debt - Senior Secured Credit Facility - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Jun. 01, 2019	May 31, 2019	Dec. 31, 2018	Jul. 31, 2015
Debt Instrument [Line Items]
Senior Secured Credit Facility	$ 245,000,000			$ 183,000,000
Senior Secured Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate on borrowings	5.32%
Debt instrument borrowing base	$ 44,600,000
Senior secured credit facility sub limit	2,500,000
Debt instrument expanded borrowing base	$ 290,000,000
Senior Secured Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
Debt instrument expanded borrowing base			$ 275,000,000
Senior Secured Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
Debt instrument expanded borrowing base		$ 290,000,000
Letter of Credit | Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt instrument borrowing base	$ 400,000
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	Apr. 15, 2016	Jan. 31, 2018	Sep. 30, 2019
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)				11.25%
11.25% Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount			$ 250,000,000
Debt instrument interest rate (as a percent)			11.25%	11.25%
Debt instrument proceeds net			$ 244,400,000
Redemption price, percentage	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 | Maximum
Debt Instrument [Line Items]
Redemption price, percentage	35.00%
Redemption period	180 days
8.750% Senior Notes Due April 15, 2019
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			8.75%	8.75%
Payment of principal, interest and prepayment premium			$ 162,000,000
Redemption price, percentage		104.375%
January 1, 2021
Debt Instrument [Line Items]
Redemption price, percentage	108.438%
January 1, 2021 | 11.25% Senior Notes
Debt Instrument [Line Items]
Redemption price, percentage	100.00%
January 1, 2022
Debt Instrument [Line Items]
Redemption price, percentage	105.625%
July 1, 2022
Debt Instrument [Line Items]
Redemption price, percentage	100.00%

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	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 31, 2018
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			11.25%			11.25%
Loss on extinguishment of debt			$ 0	$ 0		$ 0	$ (8,619)
11.25% Senior Notes
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			11.25%			11.25%		11.25%
Redemption price, percentage	111.25%
8.750% Senior Notes Due April 15, 2019
Debt Instrument [Line Items]
Debt instrument interest rate (as a percent)			8.75%			8.75%		8.75%
Redemption price, percentage		104.375%
Redemption price, value		$ 158,500
8.750% Senior Notes Due April 15, 2019 | Unsecured Debt
Debt Instrument [Line Items]
Loss on extinguishment of debt					$ (8,600)

Long-Term Debt Long-Term Debt -

Long-Term Debt Long-Term Debt - Debt Issuance Costs (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Senior Secured Credit Facility
Debt Instrument [Line Items]
Debt issuance costs	$ 1	$ 1.7

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	Sep. 28, 2018USD ($)shares	Jun. 30, 2017$ / sharesRateshares	Sep. 30, 2019shares	Jun. 30, 2019shares	Mar. 31, 2019shares	Sep. 30, 2018shares	Jun. 30, 2018shares	Mar. 31, 2018shares	Sep. 30, 2019$ / sharesRateshares	Sep. 30, 2018	Dec. 31, 2018shares
Class of Stock [Line Items]
Minimum percentage of outstanding common stock beneficially own by approved holders		10.00%
Debt instrument interest rate (as a percent)			11.25%						11.25%
Retirement of Class B Common Stock, shares (in shares)	2,500
Retirement of Class B Common Stock, value | $	$ 10
Senior Unsecured Notes
Class of Stock [Line Items]
Unsecured notes, maturity period									2 years	2 years
Debt instrument interest rate (as a percent)			9.00%						9.00%
Series A-1 Convertible Participating Preferred Stock
Class of Stock [Line Items]
Conversion of stock threshold trading days		20 days
Conversion of stock threshold consecutive trading days		30 days
Threshold percentage of conversion price before June 15, 2020 | Rate		175.00%
Threshold percentage of conversion price after June 15, 2020 | Rate		150.00%
Preferred stock, dividend rate, percentage									20.00%
Payment-in-kind dividends (in shares)			2,159	2,112	2,065	1,975	1,932	1,889	6,336		11,784
Series A-1 Convertible Participating Preferred Stock | Battlecat and Marquis
Class of Stock [Line Items]
Number of shares issued (in shares)		5,400
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.001
Series A-2 Convertible Participating Preferred Stock | Battlecat and Marquis
Class of Stock [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.001
Convertible participating preferred stock, number of shares issued (in shares)		74,600
Series B Convertible Participating Preferred Stock
Class of Stock [Line Items]
Preferred stock to common stock conversion basis									one-for-one
Series B Convertible Participating Preferred Stock | Battlecat Oil & Gas, LLC
Class of Stock [Line Items]
Number of shares issued in connection with acquisition (in shares)		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 (in shares)		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 (in dollars per share) | $ / shares									$ 975
Preferred stock, increase in dividend rate for next succeeding dividend period | Rate									5.00%
Preferred stock, additional increase in dividend rate for each successive dividend period | Rate									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 | Rate									20.00%
Class A Voting Common Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares		$ 1,000
Convertible, conversion ratio									0.1666

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expenses		$ 2,000,000	$ 2,100,000
Stock-based compensation liability	$ 1,300,000	1,300,000
Unrecognized compensation expense	3,700,000	$ 3,700,000
Unrecognized stock-based compensation cost, recognition period		2 years 1 month 20 days
Vested in period, fair value	0
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Stock-based compensation expenses		$ (100,000)	$ 1,500,000
Stock-based compensation liability	600,000	600,000
Unrecognized compensation expense	$ 200,000	$ 200,000
Unrecognized stock-based compensation cost, recognition period		1 year 1 day
Expiration period		5 years

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Outstanding Restricted Stock Units (Details) - Restricted Stock Units (RSUs)	9 Months Ended
	Sep. 30, 2019$ / sharesshares
Non-vested Shares [Roll Forward]
Non-vested RSUs at beginning of period (in shares) | shares	1,011,045
Granted, Shares (in shares) | shares	1,274,750
Vested (in shares) | shares	(434,900)
Forfeited (in shares) | shares	(3,450)
Non-vested RSUs at end of period (in shares) | shares	1,847,445
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Non-vested RSUs, beginning of period (in dollars per share) | $ / shares	$ 5.06
Granted (in dollars per share) | $ / shares	3.42
Vested (in dollars per share) | $ / shares	4.64
Forfeited (in dollars per share) | $ / shares	0
Non-vested RSUs, end of period (in dollars per share) | $ / shares	$ 4.04

Stock-Based Compensation - Sc_2

Stock-Based Compensation - Schedule of Outstanding Stock Appreciation Rights (Details) - Stock Appreciation Rights (SARs) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Outstanding Shares [Roll Forward]
Outstanding at beginning of period (in shares)	1,010,000
Granted (in shares)	0
Exercised (in shares)	0
Expired/forfeited (in shares)	0
Outstanding at end of period (in shares)	1,010,000	1,010,000
Options vested and exercisable (in shares)	606,250	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)	$ 6.30
Granted, Weighted Average Exercise Price Per Share (in dollars per share)	0
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	$ 6.30
Options vested and exercisable, Weighted Average Exercise Price Per Share (in dollars per share)	$ 6.65	$ 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)	2 years 9 months 8 days	3 years 5 months 18 days
Options vested and exercisable, Weighted Average Remaining Contractual Term (in years)	2 years 7 months 30 days	3 years 2 months 15 days

Related Party Activities - Addi

Related Party Activities - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2019USD ($)	Jan. 31, 2017USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Dec. 31, 2016USD ($)shares	Oct. 09, 2018shares	Oct. 26, 2016directorDirector	Aug. 31, 2016USD ($)$ / sharesshares
Related Party Transaction [Line Items]
Debt instrument interest rate (as a percent)			11.25%		11.25%
Leucadia
Related Party Transaction [Line Items]
Offering fee recorded as reduction to additional paid-in capital		$ 1
Leucadia | Class A Voting Common Stock
Related Party Transaction [Line Items]
Number of common shares issued (in shares) | shares							3,478,261
Common shares issued, Value							$ 20
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 (as a percent)										12.00%
Warrants term										5 years
Warrants to purchase common stock (in shares) | shares										988,000
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										$ 49.9
Juneau Energy, LLC | Securities Purchase Agreement
Related Party Transaction [Line Items]
Warrants to purchase common stock (in shares) | shares							500,000
Juneau Energy, LLC | Securities Purchase Agreement | Second Lien Notes
Related Party Transaction [Line Items]
Debt instrument face amount							$ 25
Repayment of principal second lien notes							$ 21
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			$ 0.5	$ 0.6	$ 1.3	$ 1.4
Affiliated Entity
Related Party Transaction [Line Items]
Payments to acquire land	$ 2
Affiliated Entity | Class A Voting Common Stock
Related Party Transaction [Line Items]
Sale or distribution of common stock (in shares) | shares								4,174,259
Amount of outstanding common stock sold and distributed								17.00%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details)	1 Months Ended
	Jul. 31, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
Aggregate drilling rate	$ 22,500
Early termination fee amount	$ 15,000