Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 4,634	$ 2,934
Accounts receivable	183	277
Accounts receivable - related entities	7,050	6,700
Prepaid expenses	1,387	931
Fair value of commodity derivative instruments	800	3,044
Total current assets	14,054	13,886
Oil and natural gas properties and related equipment
Oil and natural gas properties, equipment and facilities (successful efforts method)	112,476	112,173
Gathering and transportation assets	186,874	186,406
Less: accumulated depreciation, depletion, amortization and impairment	(109,136)	(100,245)
Oil and natural gas properties and equipment, net	190,214	198,334
Other assets
Intangible assets, net	148,611	158,706
Fair value of commodity derivative instruments	176	876
Equity investments	105,352	114,465
Other non-current assets	318	418
Total assets	458,725	486,685
Current liabilities
Accounts payable and accrued liabilities	5,044	4,678
Accounts payable and accrued liabilities - related entities	4,720	5,641
Royalties payable	359	359
Short-term debt, net of debt issuance costs	161,245
Fair value of commodity derivative instruments		6
Other liabilities	146	125
Total current liabilities	171,514	10,809
Other liabilities
Asset retirement obligation	6,763	6,200
Long-term debt, net of debt issuance costs		178,582
Class C preferred units	262,113
Other liabilities	6,570	5,857
Total other liabilities	275,446	190,639
Total liabilities	446,960	201,448
Commitments and contingencies (See Note 12)
Mezzanine equity
Class B preferred units, 0 and 31,310,896 units issued and outstanding as of September 30, 2019 and December 31, 2018, respectively		349,857
Partners' deficit
Common units, 20,089,827 and 16,486,239 units issued and outstanding as of September 30, 2019 and December 31, 2018, respectively	11,765	(64,620)
Total partners' capital (deficit)	11,765	(64,620)
Total liabilities and partners' capital	$ 458,725	$ 486,685