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Convertible Subordinated Notes (Liability and Equity Components) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Amortization of debt issuance costs | $ 552 | $ 576 | $ 782
Convertible subordinated notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest expense | 0 | 18 | 149
Accretion of discount | 0 | 20 | 216
Amortization of debt issuance costs | $ 0 | $ 1 | $ 20

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- Definition Amount of accretion of discount for the standardized measure of discounted future net cash flow related to proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126939881&loc=d3e62500-109447 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35A -URI https://asc.fasb.org/extlink&oid=126939881&loc=SL6807758-109447 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=34713648&loc=d3e63123-109448 + Details
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