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Income Taxes - Reconciliation of Effective Tax Rate to the Statutory Federal Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 03, 2019
Jul. 28, 2018
Jul. 29, 2017
Income Tax Disclosure [Abstract]      
Tax at federal statutory rate, amount $ 6,473 $ 14,752 $ 4,481
Tax at federal statutory rate, percent 21.00% 27.00% 35.00%
State taxes, net of federal effect, amount $ (1,068) $ (755) $ 1,270
State taxes, net of federal effect, percent (3.50%) (1.40%) 9.90%
Remeasurement of preferred stock warrant liability, amount $ 0 $ (2,881) $ 6,608
Remeasurement of preferred stock warrant liability, percent 0.00% (5.30%) 51.60%
Stock-based compensation, amount $ (7,114) $ (5,454) $ 229
Stock-based compensation, percent (23.10%) (9.90%) 1.80%
Tax Act impact, amount $ 0 $ 6,670 $ 0
Tax Act impact, percent 0.00% 12.20% 0.00%
Research and development credits, amount $ (5,984) $ (2,146) $ 0
Research and development credits, percent (19.40%) (3.90%) (0.00%)
Uncertain tax positions, amount $ 2,030 $ 2,846 $ 23
Uncertain tax positions, percent 6.60% 5.10% 0.20%
Return to provision, amount $ (1,821) $ (3,891) $ 0
Return to provision, percent (5.90%) (7.10%) 0.00%
Nondeductible compensation, amount $ 765 $ 652 $ 1,188
Nondeductible compensation, percent 2.50% 1.20% 9.30%
Other, amount $ 659 $ 20 $ (404)
Other, percent 2.10% 0.00% (3.20%)
Provision (benefit) for income taxes $ (6,060) $ 9,813 $ 13,395
Effective tax rate, percent (19.70%) 17.90% 104.60%