v3.20.4

Income Taxes - Summary of Significant Components of Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 379,613 | $ 263,512
Reserves and accruals | 14,131 | 10,425
Research and development credits | 104,110 | 73,442
Lease Obligation | 91,373 | 81,639
Stock-based compensation | 28,318 | 17,494
Total deferred tax assets | 617,545 | 446,512
Deferred tax liabilities: |  |
Right-of-use asset | (70,755) | (72,243)
Depreciation and amortization | (11,707) | (10,916)
Total deferred tax liabilities | (82,462) | (83,159)
Valuation allowance | (530,887) | (361,233)
Net deferred tax assets | $ 4,196 | $ 2,120

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