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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary Of Significant Accounting Policies [Abstract] |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash |
|  | December 31,
|  | 2019 |  | 2018
|  | (in thousands)
Cash and cash equivalents |  | $ | 45,917 |  | $ | 33,360
Restricted cash - current |  |  | 911 |  |  | 804
Restricted cash - non-current |  |  | 925 |  |  | 920
Abandonment funding |  |  | 11,371 |  |  | 11,571
Total cash, cash equivalents and restricted cash |  | $ | 59,124 |  | $ | 46,655
Rollforward Analysis of the Allowance Against Accounts Receivable Balance |
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
| (in thousands)
Allowance for bad debt |  |  |  |  |  |  |  |
Balance at beginning of year | $ | (2,535) |  | $ | (7,033) |  | $ | (5,211)
Bad debt recovery (charge) |  | 341 |  |  | 77 |  |  | (452)
Reclassification to leasehold costs related to signing bonus |  | — |  |  | 4,197 |  |  | —
Reclassification of Sojitz acquisition |  | — |  |  | — |  |  | (694)
Adjustment associated with settlement of customs audit |  | 623 |  |  | — |  |  | —
Foreign currency gain |  | 63 |  |  | 224 |  |  | (676)
Balance at end of period | $ | (1,508) |  | $ | (2,535) |  | $ | (7,033)
Assets and Liabilities Measured on Recurring Basis |
|  |  |  |  | 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
|  |  |  |  | As of December 31, 2018
|  | Balance Sheet Line |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  |  |  | (in thousands)
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative asset commodity swaps |  |  | Prepayments and other |  | $ | — |  | $ | 3,520 |  | $ | — |  | $ | 3,520
|  |  |  |  | $ | — |  | $ | 3,520 |  | $ | — |  | $ | 3,520
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SARs liability |  |  | Accrued liabilities |  | $ | — |  | $ | 1,007 |  | $ | — |  | $ | 1,007
SARs liability |  |  | Other long-term liabilities |  |  | — |  |  | 625 |  |  | — |  |  | 625
|  |  |  |  | $ | — |  | $ | 1,632 |  | $ | — |  | $ | 1,632

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