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Income Taxes - Net operating losses (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | $ 2,900 | $ 1,800 | $ 1,900
NOLs, annual limitations on use | 71 |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | 900 | 800 |
NOLs, annual limitations on use | 33,500 |  |
NOLs, without regard to this permanent write-off | 33,500 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | 2,000 | 1,000 |
NOLs, annual limitations on use | 14,000 |  |
NOLs, without regard to this permanent write-off | 15,200 |  |
Foreign |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Net operating losses | $ 0 | $ 0 |

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- Definition Amount of annual of the limitations on the use of all operating loss carryforwards available to reduce future taxable income. + References No definition available. + Details
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- Definition Amount of expirations of operating loss carryforwards. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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