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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 42,251 $ 46,273
Research and development credits, net of uncertain tax positions 27,743 25,386
Accruals, reserves, and other 12,026 12,021
Stock-based compensation 2,362 3,306
Depreciation and amortization 1,537 2,219
Operating lease liability 6,049 7,061
Gross deferred tax assets 91,968 96,266
Valuation allowance (82,938) (85,743)
Total deferred tax assets 9,030 10,523
Deferred tax liabilities:    
Deferred contract acquisition costs (2,068) (2,245)
Operating lease right of use asset (5,996) (7,088)
Other (22) (19)
Total deferred tax liabilities (8,086) (9,352)
Net deferred tax assets $ 944 $ 1,171