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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Significant Accounting Policies [Abstract] |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash |
|  | As of December 31,
|  | 2020 |  | 2019
|  | (in thousands)
Cash and cash equivalents |  | $ | 47,853 |  | $ | 45,917
Restricted cash - current |  |  | 86 |  |  | 911
Restricted cash - non-current |  |  | 925 |  |  | 925
Abandonment funding |  |  | 12,453 |  |  | 11,371
Total cash, cash equivalents and restricted cash |  | $ | 61,317 |  | $ | 59,124
Rollforward of Aggregate Allowance for Bad Debt |
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (in thousands)
Allowance for bad debt |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (1,508) |  | $ | (2,535) |  | $ | (7,033)
Bad debt charge |  | (1,165) |  |  | 341 |  |  | 77
Adjustment associated with reversal of allowance on Mutamba receivable |  | 593 |  |  | — |  |  | —
Adjustment associated with settlement of customs audit |  | — |  |  | 623 |  |  | —
Reclassification to leasehold costs related to signing bonus |  | — |  |  | — |  |  | 4,197
Foreign currency gain (loss) |  | (193) |  |  | 63 |  |  | 224
Balance at end of period | $ | (2,273) |  | $ | (1,508) |  | $ | (2,535)
Assets and Liabilities Measured on Recurring Basis |
|  |  |  |  | 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
|  |  |  |  | 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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