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Income Taxes - Operating loss carry forwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Net operating loss carry forwards |  |
Net operating loss carry forward | $ 7.5 | $ 6.4
Valuation allowance | 42.1 | 28.6
increase in valuation allowance | 12.1 |
Foreign |  |
Net operating loss carry forwards |  |
Net operating loss carryforward, not subject to expiration | 27.2 |
Net operating loss carryforward, subject to expiration | 1.3 |
Operating loss carryforward | 27.2 |
Tax credit carryforward | 34.4 | $ 32.7
Austrian Operations |  |
Net operating loss carry forwards |  |
Operating loss carryforward | 27.2 |
Korean Operations |  |
Net operating loss carry forwards |  |
Operating loss carryforward | 3.8 |
U.S. |  |
Net operating loss carry forwards |  |
Capital loss carry forward | 1.0 |
Domestic |  |
Net operating loss carry forwards |  |
Net operating loss carryforward, subject to expiration | 2.5 |
Operating loss carryforward | 3.8 |
Capital loss carry forward | $ 1.0 |

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