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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforward | $ 210,301 | $ 172,113
Research and development credits | 42,490 | 35,670
Stock-based compensation | 15,628 | 11,905
Lease liabilities | 3,487 |
Other | 3,818 | 3,171
Total gross deferred tax assets | 275,724 | 222,859
Deferred tax liabilities: |  |
Right-of-use lease assets | (3,385) |
Total gross deferred tax liabilities | (3,385) |
Valuation allowance | $ (272,339) | $ (222,859)

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