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v3.20.4

Income Taxes - Deferred and Valuation (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Deferred tax assets |  |
Intellectual property | $ 68,209 | $ 46,521
Amortization/depreciation | 489 | 2,329
Research tax credit | 182,651 | 141,669
Net operating loss carry forwards | 305,876 | 286,850
Deferred reimbursements | 1,912 | 2,230
Non-cash stock issue | 17,553 | 19,058
Interest carry forward limitation | 5,655 | 2,224
Lease liability | 9,235 | 6,983
Other | 10,855 | 13,921
Gross deferred tax assets | 602,435 | 521,785
Deferred tax liabilities |  |
Business acquisition | (4,937) | (5,051)
Royalty payable | (68,209) | (46,521)
Convertible notes | (94) | (653)
Advanced R&D payments | (1,776) | (2,611)
Right of use asset | (3,420) | (5,643)
Total net deferred tax assets | 523,999 | 461,306
Less: valuation allowance | (528,895) | (466,357)
Net deferred tax liability | (4,896) | $ (5,051)
Increase in the valuation allowance | $ 62,500 |

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