CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (28,914,588)	$ (5,345,363)	$ (999,392)	$ (52,824,471)	$ (54,625,438)	$ (52,445,568)	$ (52,282,223)
Adjustments to reconcile net loss to net cash provided by operating activities:
Provision for deferred income taxes						1,475,648
Depreciation and depletion expense	15,098,107		7,607,137		37,690,558	15,494,439
Impairment of oil and natural gas properties	34,880,071		0		65,828,980	54,753,444
Amortization of right-of-use assets					88,058
Amortization of loan origination costs					783,961	208,276
Equity loss in affiliate	80,896				80,896
Unit-based compensation					5,692,926	2,143,047
Loss on commodity derivative instruments, net of settlements					878,255	3,495,463
Changes in operating assets and liabilities:
Oil, natural gas and NGL receivables					5,270,397	(8,781,555)
Accounts receivable and other current assets					(389,839)	(190,093)
Accounts payable					(399,679)	1,172,615
Other current liabilities					3,198,198	1,266,354
Operating lease liabilities					(117,312)
Net cash provided by operating activities					63,979,961	18,592,070
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment					(829,724)	(396,480)
Proceeds from sale of oil and natural gas properties						10,576,595
Purchase of oil and natural gas properties					(1,192,432)	(210,574,890)
Deposits on oil and natural gas properties					(986,000)
Investment in affiliate					(2,965,933)
Net cash used in investing activities					(5,974,089)	(200,394,775)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from the issuance of Series A preferred units, net of issuance costs						103,359,603
Contributions from Class B unitholders					470,000	647,663
Redemption of Class B contributions on converted units					(73,250)
Issuance costs paid on Series A preferred units					(717,612)
Distributions to unitholders					(51,157,094)	(24,672,785)
Distributions on Series A preferred units					(5,775,000)	(705,834)
Distributions to Class B unitholders					(71,042)
Borrowings on long-term debt					3,951,933	124,336,547
Repayments on long-term debt						(6,870,596)
Payment of loan origination costs					(88,776)	(3,389,421)
Restricted units used for tax withholding					(21,036)
Net cash (used in) provided by financing activities					(53,481,877)	192,705,177
NET INCREASE IN CASH AND CASH EQUIVALENTS					4,523,995	10,902,472
CASH AND CASH EQUIVALENTS, beginning of period		$ 15,773,987		$ 5,625,495	15,773,987	5,625,495	5,625,495
CASH AND CASH EQUIVALENTS, end of period	$ 20,297,982		$ 16,527,967		20,297,982	16,527,967	$ 15,773,987
Supplemental cash flow information:
Cash paid for interest					3,572,952	2,220,885
Noncash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liabilities					3,554,159
Units issued in exchange for oil and natural gas properties					171,550,000	235,400,000
Distribution to Series A preferred unitholders in accounts payable						981,837
Non-cash deemed distribution to Series A preferred units					4,633,752	1,152,785
Distribution to Class B unitholders in accounts payable						$ 12,953
Redemption of Class B contributions on converted units in accounts payable					$ 200,000