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Organization and Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2021
Organization and Accounting Policies [Abstract] |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash |
|  | As of June 30,
|  | 2021 |  | 2020
|  | (in thousands)
Cash and cash equivalents |  | $ | 22,884 |  | $ | 44,841
Restricted cash - current |  |  | 83 |  |  | 1,090
Restricted cash - non-current |  |  | 1,752 |  |  | 925
Abandonment funding |  |  | 22,837 |  |  | 11,420
Total cash, cash equivalents and restricted cash |  | $ | 47,556 |  | $ | 58,276
Rollforward of Aggregate Allowance for Bad Debt |
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2021 |  |  | 2020 |  | 2021 |  | 2020
|  | (in thousands)
Allowance for bad debt |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (5,092) |  | $ | (1,725) |  | $ | (2,273) |  | $ | (1,508)
Bad debt charge |  |  | (395) |  |  | (179) |  |  | (496) |  |  | (989)
Adjustment associated with reversal of allowance on Mutamba receivable |  |  | — |  |  | — |  |  | — |  |  | 593
Adjustment associated with Sasol Acquisition |  |  | — |  |  | — |  |  | (2,879) |  |  | —
Foreign currency gain (loss) |  |  | (88) |  |  | — |  |  | 73 |  |  | —
Balance at end of period |  | $ | (5,575) |  | $ | (1,904) |  | $ | (5,575) |  | $ | (1,904)
Assets and Liabilities Measured on Recurring Basis |
|  |  | As of June 30, 2021
| Balance Sheet Line |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  | (in thousands)
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
SARs liability | Accrued liabilities |  | $ | — |  | $ | 1,181 |  | $ | — |  | $ | 1,181
Derivative liability - crude oil swaps | Accrued liabilities |  |  | — |  |  | 9,920 |  |  | — |  |  | 9,920
|  |  | $ | — |  | $ | 11,101 |  | $ | — |  | $ | 11,101
|  |  | As of December 31, 2020
| Balance Sheet Line |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  | (in thousands)
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
SARs liability | Accrued liabilities |  | $ | — |  | $ | 2,289 |  | $ | — |  | $ | 2,289
SARs liability | Other long-term liabilities |  |  | — |  |  | 193 |  |  | — |  |  | 193
|  |  | $ | — |  | $ | 2,482 |  | $ | — |  | $ | 2,482

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