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Income Taxes - Research and Development Tax Credit Carryforwards (Details) - Dec. 31, 2020 - Research and Development Tax Incentive $ in Millions, $ in Millions | USD ($) | AUD ($)
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State |  |
Tax credit carryforwards |  |
Tax credit carryforwards available to reduce future income taxes | $ 4.8 |
Federal |  |
Tax credit carryforwards |  |
Tax credit carryforwards available to reduce future income taxes | 12.3 |
Australian |  |
Tax credit carryforwards |  |
Tax credit carryforwards available to reduce future income taxes | $ 2.8 | $ 3.6

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