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Organization and Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2020
Organization and Accounting Policies [Abstract] |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash |
|  | As of September 30,
|  | 2020 |  | 2019
|  | (in thousands)
Cash and cash equivalents |  | $ | 41,986 |  | $ | 57,227
Restricted cash - current |  |  | 82 |  |  | 769
Restricted cash - non-current |  |  | 925 |  |  | 924
Abandonment funding |  |  | 11,885 |  |  | 11,112
Total cash, cash equivalents and restricted cash |  | $ | 54,878 |  | $ | 70,032
Rollforward of Aggregate Allowance for Bad Debt |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2020 |  |  | 2019 |  | 2020 |  | 2019
|  | (in thousands)
Allowance for bad debt |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (1,904) |  | $ | (1,876) |  | $ | (1,508) |  | $ | (2,535)
Bad debt charge |  |  | (151) |  |  | (54) |  |  | (1,140) |  |  | (30)
Adjustment associated with reversal of allowance on Mutamba receivable |  |  | — |  |  | — |  |  | 593 |  |  | —
Adjustment associated with settlement of customs audit |  |  | — |  |  | — |  |  | — |  |  | 623
Foreign currency gain |  |  | — |  |  | 53 |  |  | — |  |  | 65
Balance at end of period |  | $ | (2,055) |  | $ | (1,877) |  | $ | (2,055) |  | $ | (1,877)
Assets and Liabilities Measured on Recurring Basis |
|  |  |  |  | As of September 30, 2020
|  | Balance Sheet Line |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  |  |  | (in thousands)
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs liability |  |  | Accrued liabilities |  | $ | — |  | $ | 823 |  | $ | — |  | $ | 823
SARs liability |  |  | Other long-term liabilities |  |  | — |  |  | 43 |  |  | — |  |  | 43
|  |  |  |  | $ | — |  | $ | 866 |  | $ | — |  | $ | 866
|  |  |  |  | As of December 31, 2019
|  | Balance Sheet Line |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  |  |  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset commodity swaps |  |  | Prepayments and other |  | $ | — |  | $ | 636 |  | $ | — |  | $ | 636
|  |  |  |  | $ | — |  | $ | 636 |  | $ | — |  | $ | 636
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs liability |  |  | Accrued liabilities |  | $ | — |  | $ | 2,638 |  | $ | — |  | $ | 2,638
SARs liability |  |  | Other long-term liabilities |  |  | — |  |  | 852 |  |  | — |  |  | 852
|  |  |  |  | $ | — |  | $ | 3,490 |  | $ | — |  | $ | 3,490

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