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v3.20.4

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforward | $ 251,971 | $ 210,301
Research and development credits | 49,683 | 42,490
Stock-based compensation | 20,211 | 15,628
Lease liabilities | 4,330 | 3,487
Other | 3,777 | 3,818
Total gross deferred tax assets | 329,972 | 275,724
Deferred tax liabilities: |  |
Right-of-use lease assets | (4,014) | (3,385)
Total gross deferred tax liabilities | (4,014) | (3,385)
Valuation allowance | $ (325,958) | $ (272,339)

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