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INCOME TAXES (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of Provision for (Benefit from) Income Taxes Based on Loss Before Income Taxes
The provision for (benefit from) income taxes was based on loss before income taxes as follows:
Years Ended December 31
201920182017
U.S. Source$(182,112) $(128,700) $(19,461) 
Non-U.S. Source87,301  (14,005) (16,414) 
Loss before income taxes$(94,811) $(142,705) $(35,875) 
Schedule of Components of Provision for (Benefit From) Income Taxes
The U.S. and foreign components of the provision for (benefit from) income taxes were as follows:

Years Ended December 31,
201920182017
Provision for (benefit from) current income tax expense:
Federal$5,127  $(2,660) $29,848  
State and local1,331  588  2,880  
Foreign5,339  4,956  3,975  
11,797  2,884  36,703  
Provision for (benefit from) deferred income taxes:
Federal(58,311) (72,074) 12,446  
State and local(5,394) (994) 32,336  
Foreign(19,055) 4,690  (318) 
(82,760) (68,378) 44,464  
Provision for (benefit from) income taxes$(70,963) $(65,494) $81,167  
Schedule of Reconciliation of Statutory Federal Income Tax Rate to Company's Effective Income Tax Rate
The following is a reconciliation of the statutory federal income tax (benefit) expense to the Company’s effective tax rate:
December 31,
201920182017
Federal statutory income tax benefit$(19,911) $(29,968) $(12,556) 
State and local taxes(2,784) (276) 7,282  
Orphan Drug & General Business Credit(43,124) (66,451) (33,683) 
Stock compensation expense239  (5,647) (6,843) 
Changes in the fair value of contingent consideration(1,804) (2,361) 1,099  
Foreign Source Income Subject to US Tax(52) 6,543  30,181  
Foreign tax rate differential (1)
(30,639) 12,583  9,403  
Section 162(m) limitation8,294  7,440  9,492  
Tax Cuts and Jobs Act of 2017—  —  42,338  
Tax Reserves12,123  8,545  2,262  
Other(1,132) (423) (2,940) 
Valuation allowance/deferred benefit7,827  4,521  35,132  
Effective income tax (benefit) expense$(70,963) $(65,494) $81,167  
(1)  For the year ended December 31, 2019, the foreign rate differential included foreign local tax expense which was at an effective rate lower than the U.S. statutory rate and was offset by the benefit of the valuation allowance release against the deferred tax assets of the Company’s Dutch subsidiary of $29.6 million.
Schedule of Components of Net Deferred Tax Assets
The significant components of the Company’s net deferred tax assets were as follows:
December 31,
20192018
Net deferred tax assets:
Net operating loss carryforwards$32,181  $42,007  
Tax credit carryforwards508,560  466,066  
Accrued expenses, reserves, and prepaids61,807  55,041  
Intangible assets29,413  18,734  
Stock-based compensation42,873  35,966  
Lease liabilities11,470  —  
Inventory6,290  12,859  
Other575  278  
Valuation allowance(86,197) (107,928) 
Total deferred tax assets606,972  523,023  
Joint venture basis difference(993) (1,010) 
Acquired intangibles(1,647) (6,508) 
Deferred revenue(3,003) (4,480) 
Convertible notes discount(2,364) (5,157) 
ROU assets(10,258) —  
Property, plant and equipment(46,642) (44,916) 
Total deferred tax liabilities(64,907) (62,071) 
Net deferred tax assets$542,065  $460,952  
Summary of Expiration of not Utilized Net Operating Loss and Tax Credit Carryforwards
As of December 31, 2019, the Company had the following net operating loss and tax credit carryforwards, which if not utilized, will expire as follows:
TypeAmountYear
Federal net operating loss carryforwards$144,566  2028 – 2037
Federal R&D and orphan drug credit carryforwards$507,292  2030 – 2038
State net operating loss carryforwards$161,341  2020 – 2039
Dutch net operating loss carryforwards$89,064  2021 – 2025
Schedule of Reconciliation of Unrecognized Tax Benefits
A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2019 and 2018, is as follows:
December 31,
20192018
Balance at beginning of period$147,445  $113,486  
Additions based on tax positions related to the current year
19,287  30,811  
(Deletions) Additions for tax positions of prior years2,016  3,148  
Balance at end of period$168,748  $147,445