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Income Taxes - Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Significant components of the Company's deferred tax assets and liabilities |  |
Intangible assets | $ 1,197 | $ 1,197
Deferred revenue | 16,274 | 8,051
Interest expense | 21,183 | 10,216
Other reserves and accruals | 5,087 | 1,504
Tax credit carryforwards | 5,613 | 3,843
Amortization of stock-based compensation | 3,900 | 9,081
Non-Compensatory warrants | 5,020 | 4,322
Capitalized research & development expenditures | 35,353 | 27,084
Right of use liability (operating leases) | 27,715 | 22,647
Net operating loss carryforwards | 120,992 | 64,014
Total deferred tax asset | 242,334 | 151,959
Valuation allowance | (171,594) | (118,677)
Net deferred tax assets | 70,740 | 33,282
Intangible assets | (7,360) | (15)
Convertible debt | (27,420) | (6,592)
Right of use asset (operating leases) | (27,684) | (23,040)
Other reserves and accruals | (12) | (16)
Property, plant and equipment and right of use assets | (9,191) | (3,619)
Deferred tax liability | (71,667) | (33,282)
Net | (927) |
Deferred tax assets, valuation allowance | 171,600 | 118,700
U.S. |  |
Significant components of the Company's deferred tax assets and liabilities |  |
Deferred revenue | 16,082 | 7,922
Interest expense | 21,183 | 10,216
Other reserves and accruals | 5,087 | 1,504
Tax credit carryforwards | 4,360 | 2,590
Amortization of stock-based compensation | 3,900 | 9,081
Non-Compensatory warrants | 5,020 | 4,322
Capitalized research & development expenditures | 30,870 | 22,601
Right of use liability (operating leases) | 27,715 | 22,647
Net operating loss carryforwards | 110,978 | 54,438
Total deferred tax asset | 225,195 | 135,321
Valuation allowance | (154,467) | (102,055)
Net deferred tax assets | 70,728 | 33,266
Intangible assets | (7,360) | (15)
Convertible debt | (27,420) | (6,592)
Right of use asset (operating leases) | (27,684) | (23,040)
Property, plant and equipment and right of use assets | (9,191) | (3,619)
Deferred tax liability | (71,655) | (33,266)
Net | (927) |
Foreign |  |
Significant components of the Company's deferred tax assets and liabilities |  |
Intangible assets | 1,197 | 1,197
Deferred revenue | 192 | 129
Tax credit carryforwards | 1,253 | 1,253
Capitalized research & development expenditures | 4,483 | 4,483
Net operating loss carryforwards | 10,014 | 9,576
Total deferred tax asset | 17,139 | 16,638
Valuation allowance | (17,127) | (16,622)
Net deferred tax assets | 12 | 16
Other reserves and accruals | (12) | (16)
Deferred tax liability | $ (12) | $ (16)

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