Summary of Significant Accounting Policies (Tables) |
12 Months Ended |
|---|---|
Dec. 31, 2021 | |
| Summary of Significant Accounting Policies [Abstract] | |
| Reconciliation of Cash, Cash Equivalents, and Restricted Cash | As of December 31, 2021 2020 (in thousands)Cash and cash equivalents $48,675 $47,853Restricted cash - current 79 86Restricted cash - non-current 1,752 925Abandonment funding 21,808 12,453Total cash, cash equivalents and restricted cash $72,314 $61,317 |
| Analysis of Change in Allowance for Doubtful Accounts | Year Ended December 31, 2021 2020 2019 (in thousands)Allowance for bad debt Balance at beginning of period $ (2,273) $ (1,508) $ (2,535)Bad debt (charge) income, net of receipts (875) (1,165) 341Adjustment associated with reversal of allowance on Mutamba receivable — 593 623Adjustment associated with Sasol Acquisition (2,879) — —Foreign currency gain (loss) 286 (193) 63Balance at end of period $ (5,741) $ (2,273) $ (1,508) |
| Assets and Liabilities Measured on Recurring Basis | As of December 31, 2021 Balance Sheet Line Level 1 Level 2 Level 3 Total (in thousands)Liabilities SARs liabilityAccrued liabilities $ — $ 609 $ — $ 609Derivative liability - crude oil swapsAccrued liabilities — 4,806 — 4,806 $ — $ 5,415 $ — $ 5,415 As of December 31, 2020 Balance Sheet Line Level 1 Level 2 Level 3 Total (in thousands)Liabilities SARs liabilityAccrued liabilities $ — $ 2,289 $ — $ 2,289SARs liabilityOther long-term liabilities — 193 — 193 $ — $ 2,482 $ — $ 2,482 |
| X | ||||||||||
- Definition Reconciliation Of Cash, Cash Equivalents, And Restricted Cash [Table Text Block] No definition available.
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Tabular disclosure of allowance for credit loss on financing receivable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|