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Income Taxes
 12 Months Ended
Dec. 31, 2023
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The components of (loss) income before income taxes for the following years ended December 31, are as follows: 
(Loss) Income Before Income Taxes:202320222021
Ireland$(45,689)$(53,717)$(36,631)
U.S.(114,942)(57,755)(56,687)
France(146)33 173 
Total loss before income taxes$(160,777)$(111,439)$(93,145)

The income tax (benefit) provision consists of the following for the years ended December 31:  

 Income Tax (Benefit) Provision:202320222021
Current:  
U.S. - State$(661)$— $60 
Total current(661)— 60 
Deferred:  
U.S. - Federal— 25,896 (15,876)
U.S. - State160 129 — 
Total deferred160 26,025 (15,876)
Income tax (benefit) provision$(501)$26,025 $(15,816)

The reconciliation between income taxes at the statutory rate and the Company’s (benefit) provision for income taxes is as follows for the following years ended December 31: 
 Reconciliation to Effective Income Tax Rate:202320222021
Income tax (benefit) provision - at statutory tax rate$(20,097)$(13,916)$(11,642)
Differences in international tax rates(6,341)(9,921)(8,950)
Change in valuation allowances24,332 48,734 4,296 
Nondeductible share-based compensation798 1,424 645 
Unrealized tax benefits160 258 239 
State and local taxes (net of federal)(5,614)(4,467)60 
Nondeductible interest expense4,362 4,239 2,173 
Orphan drug and R&D tax credit899 — (1,524)
Other1,000 (326)(1,113)
Income tax (benefit) provision - at effective income tax rate$(501)$26,025 $(15,816)

In 2023, the income tax benefit was $501, a change of $26,526 from income tax provision of $26,025. The change in the effective tax rate for the year ended December 31, 2023 is primarily driven by the valuation allowances recorded against our deferred tax assets during the prior period. The effective tax rate for 2021 was impacted by the geographic mix of earnings.

Unrecognized Tax Benefits

The Company or one of its subsidiaries files income tax returns in Ireland, France, U.S. and various states. The Company is no longer subject to Irish, French, U.S. Federal, and state and local examinations for years before 2019.

The following table summarizes the activity related to the Company’s unrecognized tax benefits for the twelve months ended December 31:

 Unrecognized Tax Benefit Activity202320222021
Balance at January 1: $3,143 $3,143 $3,143 
Increases for tax positions of prior years— — — 
Statute of limitations expiration(108)— — 
Settlements— — — 
Balance at December 31: $3,035 $3,143 $3,143 

The Company expects that within the next twelve months the unrecognized tax benefits could decrease by an immaterial amount and the interest could increase by an immaterial amount.

At December 31, 2023, 2022 and 2021, there are $3,035, $3,143,and $2,483 of unrecognized tax benefits that if recognized would affect the annual effective tax rate.

The Company recognizes interest and penalties accrued related to unrecognized tax benefits in income tax provision. During the years ended December 31, 2023, 2022 and 2021, the Company recognized approximately $268, $258 and $239 in interest and penalties. The Company had approximately $2,372, $2,103, and $1,777 for the payment of interest and penalties accrued at December 31, 2023, 2022, and 2021, respectively.
Deferred Tax Assets (Liabilities) 

Deferred income tax provisions reflect the effect of temporary differences between consolidated financial statement and tax reporting of income and expense items. The net deferred tax assets (liabilities) at December 31, 2023 and 2022 resulted from the following temporary differences: 

 Net Deferred Tax Assets and Liabilities: 20232022
Deferred tax assets:  
Net operating loss carryforwards$71,051 $53,393 
Royalty income8,378 — 
Share-based compensation7,347 4,684 
Orphan drug and R&D tax credit4,065 4,964 
Capitalized research costs1,738 2,108 
Interest expense carryforward1,368 1,216 
Other1,322 1,521 
Amortization1,159 3,541 
Gross deferred tax assets96,428 71,427 
Deferred tax liabilities:  
Prepaid expenses— (86)
Gross deferred tax liabilities— (86)
Less: valuation allowances(96,428)(71,341)
Net deferred tax assets $— $— 

At December 31, 2023, the Company had $111,647 of net operating losses in Ireland that do not have an expiration date and $212,426 of net operating losses and $5,469 163(j) carryforwards in the U.S. Of the $212,426 of net operating losses in the U.S., $10,365 were acquired due to the acquisition of FSC Therapeutics and FSC Laboratories, Inc., (collectively “FSC”) and $195,595 are due to the losses at US Holdings, of which $6,466 are state net operating losses. The portion due to the acquisition of FSC will expire in 2034 through 2035. The remaining U.S. net operating loss and 163(j) carryforwards do not have an expiration date. A valuation allowance is recorded if, based on the weight of available evidence, it is more likely than not that a deferred tax asset will not be realized. This assessment is based on an evaluation of the level of historical taxable income and projections for future taxable income. For the year ended December 31, 2023, the Company recorded a net increase to the valuation allowance related primarily to current year net operating losses of $25,087. The U.S. net operating losses are subject to an annual limitation as a result of the FSC acquisition under Internal Revenue Code Section 382 and will not be fully utilized before they expire. In addition to net operating losses and 163(j) carryforwards, the Company has U.S. Orphan Drug tax credit carryforwards of $3,059 as well as U.S. Research and Development credits of $1,005. The Orphan Drug Credit and Research and Development credits will expire in 2040 through 2043.

The Company's cumulative loss position is significant negative evidence in assessing the need for a valuation allowance on its deferred tax assets. Given the weight of objectively verifiable historical losses from operations, the Company has recorded a full valuation allowance on its deferred tax assets. The Company will be able to reverse the valuation allowance when it has shown its ability to generate taxable income on a consistent basis in future periods. The valuation allowance does not have an impact on the Company's ability to utilize any net operating losses or other tax attributes to offset cash taxes payable as these items are still eligible to be used.

The Company recorded a valuation allowance against all of its net operating losses in Ireland, France and the U.S. as of December 31, 2023 and 2022. The Company intends to continue maintaining a full valuation allowance on the Irish, French and U.S. net operating losses until there is sufficient evidence to support the reversal of all or some portion of these allowances.

At December 31, 2023, the Company has unremitted earnings of $3,854 outside of Ireland as measured on a U.S. GAAP basis. Whereas the measure of earnings for purposes of taxation of a distribution may be different for tax purposes, these earnings, which are considered to be invested indefinitely, would become subject to income tax if they were remitted as dividends or if the Company were to sell its stock in the subsidiaries, net of any prior income taxes paid. It is not practicable to estimate the amount of deferred tax liability on such earnings, if any.
R&D Tax Credits Receivable 
The French and Irish governments provide tax credits to companies for spending on innovative R&D. These credits are recorded as an offset of R&D expenses and are credited against income taxes payable in years after being incurred or, if not so utilized, are recoverable in cash after a specified period of time, which may differ depending on the tax credit regime. As of December 31, 2023, the Company’s net research tax credit receivable amounts to $1,654 and represents a French gross research tax credit of $837 and an Irish gross research tax credit of $817. As of December 31, 2022, the Company’s net research tax credit receivable amounts to $3,480 and represents a French gross research tax credit of $2,912 and an Irish gross research tax credit of $568.