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Income Taxes - Net Operating Loss Carryforwards (Details) $ in Thousands, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 AUD ($) | Dec. 31, 2019 USD ($)
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Net operating loss carryforwards |  |  |
Operating loss carryforwards available to offset future taxable income | $ 50,272 |  | $ 39,907
Australian |  |  |
Net operating loss carryforwards |  |  |
Net operating loss carryforwards | 2,800 | $ 3.7 |
State |  |  |
Net operating loss carryforwards |  |  |
Net operating loss carryforwards | 214,300 |  |
Federal |  |  |
Net operating loss carryforwards |  |  |
Net operating loss carryforwards | 222,800 |  |
Operating loss carryforwards available to offset future taxable income | 78,700 |  |
Net operating loss carryforwards with no expiration | $ 144,100 |  |

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