v3.19.3.a.u2

Income Taxes - Significant Components of Deferred Tax Assets and Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carry-forwards | $ 268,173 | $ 114,932
Stock-based compensation | 43,978 | 33,138
Capitalized licenses, R&D and start-up costs | 19,891 | 22,143
Tax credit carry-forwards | 77,222 | 53,617
Accrued expenses | 7,377 | 16,443
Deferred revenue | 53,475 | 71,209
Operating lease liabilities | 26,571 |
Lease financing obligation | 10,570 |
Lease financing obligation |  | 9,149
Other | 11 | 2,870
Total gross deferred tax assets | 507,268 | 323,501
Less: valuation allowance | (470,753) | (308,273)
Total deferred tax assets, net of valuation allowance | 36,515 | 15,228
Deferred tax liabilities: |  |
Financing right-of-use assets | (2,612) |
Operating right-of-use assets | (24,944) |
Fixed assets | (8,959) | (15,228)
Total deferred tax liabilities | (36,515) | (15,228)
Net deferred tax assets | $ 0 | $ 0

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