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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Accruals and reserves $ 1,272 $ 323
Net operating loss carryforwards 117,478 85,969
Deferred revenue 7,951 14,401
Depreciation 3,330 2,335
Research and development credits 6,201 4,665
Operating lease liabilities 20,967 19,657
Stock-based compensation 4,755 3,806
Tax credits 1,148 1,181
Other 2,105 61
Gross deferred tax assets 165,207 132,398
Valuation allowance (110,350) (94,581)
Total deferred tax assets 54,857 37,817
Deferred tax liabilities:    
Intangible assets (5,717) (2,249)
Operating lease ROU assets (16,233) (14,792)
Convertible senior notes (17,961) (9,959)
Deferred contract acquisition and fulfillment costs (15,908) (11,565)
Other (543) (20)
Total deferred tax liabilities (56,362) (38,585)
Net deferred tax liabilities $ (1,505) $ (768)