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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating loss carryforwards $ 71,051 $ 53,393
Royalty income 8,378 0
Share-based compensation 7,347 4,684
Amortization 1,159 3,541
Orphan drug and R&D tax credit 4,065 4,964
Capitalized research costs 1,738 2,108
Other 1,322 1,521
Interest expense carryforward 1,368 1,216
Gross deferred tax assets 96,428 71,427
Deferred tax liabilities:    
Prepaid expenses 0 (86)
Gross deferred tax liabilities 0 (86)
Less: valuation allowances (96,428) (71,341)
Net deferred tax assets $ 0 $ 0