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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 24, 2020
Oct. 02, 2019
Jul. 02, 2019
Income Taxes [Line Items]              
Increase (decrease) in income tax provision   $ 6,754 $ (12,537)        
Increase (decrease) in deferred income taxes   7,431 6,334 $ 19,152      
Amortization $ 3,701 3,701 11,602        
Deferred income tax expense (benefit)   680 (5,453) (18,223)      
Bankruptcy claims, amount paid to settle claims         $ 800    
Unrecognized tax benefits 2,483 2,483 3,806 4,597      
Income tax penalties and interest expense   203 555 725      
Income tax penalties and interest accrued 1,475 1,475 1,612        
Unremitted earnings   3,725          
Deferred tax assets, tax credit carryforwards, research 6,771 6,771 8,429        
Orphan drug and R&D tax credit   2,793 0 0      
CARES Act, change in tax rate, deferred tax liability, income tax benefit 9,124            
CARES Act, cash tax refunds   3,351          
CARES Act, cash refund claims   18,753          
Provisional charge related to the re-measurement of its net deferred tax assets       $ 274      
Ireland              
Income Taxes [Line Items]              
Increase (decrease) in deferred income taxes     (5,536)        
Increase (decrease) in valuation allowance, deferred tax asset, , amount     (5,536)        
Net operating loss carryforwards 118,070 118,070          
Operating loss carryforwards, valuation allowance (decrease) 4,171 4,171          
Gross research tax credit   375 821        
U.S.              
Income Taxes [Line Items]              
Amortization     8,190        
Deferred income tax expense (benefit)     (8,190)        
Net operating loss carryforwards 46,003 46,003          
Operating loss carryforwards, valuation allowance (decrease) 60 60          
France              
Income Taxes [Line Items]              
Operating loss carryforwards, valuation allowance (decrease)     (3,259)        
Gross research tax credit   6,396 $ 7,608        
Internal Revenue Service (IRS) | Speciality Pharama              
Income Taxes [Line Items]              
Bankruptcy claims, amount of filed claims likely to be denied 1,937 1,937       $ 9,302 $ 50,695
Bankruptcy claims, amount paid to settle claims 1,937 1,937          
FSC              
Income Taxes [Line Items]              
Net operating loss carryforwards 10,365 10,365          
U.S. Holdings              
Income Taxes [Line Items]              
Net operating loss carryforwards $ 35,638 $ 35,638