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v3.20.4

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Net operating losses | $ 144,064 | $ 10,142
Research tax credits | 82,378 | 13,475
Foreign tax credits | 106,795 |
Expenses not currently deductible | 44,232 | 14,276
Basis difference in fixed and intangible assets | 7,206 | 3,593
Deferred revenue | 20,828 |
Capitalized research expenses | 61,296 | 23,785
Lease liability | 17,995 | 364
Gross deferred tax assets | 484,794 | 65,635
Valuation allowance | (287,895) | (37,243)
Net deferred tax assets | 196,899 | 28,392
Deferred tax liabilities |  |
Revenue recognition | (7,733) | (32,466)
Operating leases | (17,535) | (2,665)
Acquired intangible assets, domestic | (185,662) | (17,165)
Acquired intangible assets, foreign | (33) | (2,171)
Other | (3,004) |
Net deferred tax liabilities | $ (17,068) | $ (26,075)

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