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Income Taxes - Carryforwards (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Taxes, Impairment of Carryforwards |  |  |
Federal tax credit carryforwards | $ 839 | $ 187 | $ 1,029
Compensation expense | 387 | 199 | 119
Income Taxes, Reserve Balances |  |  |
Federal tax credit carryforwards | 2,055 | 1,216 |
Compensation expense | 1,112 | 725 |
Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal net operating loss carryforwards | 120,200 |  |
Federal tax credit carryforwards that expire beginning in 2023 | 126,600 |  |
PNM |  |  |
Income Taxes, Impairment of Carryforwards |  |  |
Federal tax credit carryforwards | (427) | 427 | 0
Compensation expense | 246 | 140 | 84
Income Taxes, Reserve Balances |  |  |
Federal tax credit carryforwards | 0 | 427 |
Compensation expense | 729 | 483 |
TNMP |  |  |
Income Taxes, Impairment of Carryforwards |  |  |
Federal tax credit carryforwards | 0 | 0 | 0
Compensation expense | 140 | 59 | $ 35
Income Taxes, Reserve Balances |  |  |
Federal tax credit carryforwards | 0 | 0 |
Compensation expense | $ 381 | $ 241 |

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