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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss carryforwards $ 35,990 $ 31,302
Orphan drug and R&D tax credit 4,964 2,793
Share-based compensation 4,108 2,626
Amortization 3,429 3,701
Other 662 423
Gross deferred tax assets 49,153 40,845
Deferred tax liabilities:    
Other (925) (890)
Prepaid expenses (75) (75)
Gross deferred tax liabilities (1,000) (965)
Less: valuation allowances (24,025) (21,624)
Net deferred tax assets $ 24,128 $ 18,256