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Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Reserve and accruals | $ 2,635 | $ 1,704
Net operating loss carryforwards | 46,112 | 26,932
Operating lease liability | 9,196 | 1,448
Deferred revenue | 14,194 | 13,173
Tax credits | 17,423 | 9,569
Stock based compensation | 1,892 | 1,049
Total gross deferred tax assets | 91,452 | 53,875
Valuation allowance | (81,980) | (52,260)
Total deferred tax assets | 9,472 | 1,615
Operating lease right-of-use asset | (8,805) | (1,214)
Fixed and intangible assets | (667) | (401)
Total deferred tax liabilities | $ (9,472) | $ (1,615)

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