Quarterly report pursuant to Section 13 or 15(d)

Prepaid Expenses and Other Current Assets (Details)

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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 1,093 $ 2,279
Deposits 498 1,336
Future proceeds from sale of Magellan Petroleum UK (Note 3) 4,969 0
Tradable equity securities (Note 3) 3,731 0
Derivative asset, current (Note 6) 3,209 0
Other current assets 198 291
Total prepaid expenses and other current assets $ 13,698 $ 3,906