v3.20.4

Income taxes - Assessing realizability of deferred tax assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Federal |  |
Net operating loss carryforwards |  |
The amount of gross unrealized net operating loss carryforwards | $ 170,907 | $ 164,373
Operating loss carryforwards to be carried forward indefinitely | 87,162 |
State |  |
Net operating loss carryforwards |  |
The amount of gross unrealized net operating loss carryforwards | 181,488 | 170,831
Foreign |  |
Net operating loss carryforwards |  |
The amount of gross unrealized net operating loss carryforwards | $ 11,710 | $ 11,671

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- Definition Amount of operating loss carryforwards that are not subject to expiration dates. + References No definition available. + Details
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