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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Accruals and reserves | $ 4,795 | $ 2,540
Deferred revenue | 45,268 | 29,807
Net operating loss | 42,008 | 37,053
Research and development tax credits | 13,301 | 0
Stock-based compensation | 2,952 | 1,487
Indirect tax reserves | 4,107 | 5,682
Property and equipment, net | 1,799 | 1,665
Other | 351 | 299
Gross deferred tax assets | 114,581 | 78,533
Valuation allowance | (97,010) | (69,766)
Total deferred tax assets | 17,571 | 8,757
Deferred tax liabilities: |  |
Deferred contract costs | (10,009) | (5,774)
Other deferred tax liabilities | (7,562) | (3,132)
Total deferred tax liabilities | (17,571) | (8,906)
Net deferred tax liabilities | $ 0 | $ (149)

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