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Revenue Recognition - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Total | $ 1,872 | $ 1,573 | [1] | $ 3,433 | $ 3,128
Oil [Member] |  |  |  |  |
Total | 1,760 | 1,292 | [1] | 3,175 | 2,522
Natural Gas and Liquids [Member] |  |  |  |  |
Total | 112 | 281 | [1] | 258 | 606
North Dakota [Member] |  |  |  |  |
Total | 679 | 866 |  | 1,252 | 1,761
North Dakota [Member] | Oil [Member] |  |  |  |  |
Total | 637 | 784 |  | 1,159 | 1,589
North Dakota [Member] | Natural Gas and Liquids [Member] |  |  |  |  |
Total | 42 | 82 |  | 93 | 172
Texas [Member] |  |  |  |  |
Total | 1,193 | 562 |  | 2,181 | 1,062
Texas [Member] | Oil [Member] |  |  |  |  |
Total | 1,123 | 508 |  | 2,016 | 933
Texas [Member] | Natural Gas and Liquids [Member] |  |  |  |  |
Total | 70 | 54 |  | 165 | 129
Louisiana [Member] |  |  |  |  |
Total |  | 145 |  |  | 305
Louisiana [Member] | Oil [Member] |  |  |  |  |
Total |  |  |  |  |
Louisiana [Member] | Natural Gas and Liquids [Member] |  |  |  |  |
Total |  | $ 145 |  |  | $ 305
[1] | The condensed consolidated statement of operations for the three months ended June 30, 2018 was restated to exclude the loss on marketable equity securities of $78 thousand related to the three months ended March 31, 2018.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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