Commitments and Contingencies (Details) ft² in Thousands, $ in Millions	May. 01, 2017 ft²	Sep. 01, 2016 ft²	Jan. 16, 2015 USD ($) ft²
Schedule Of Operating Leases Square Footage [Line Items]
Lease square footage			222
Annual rent expense | $			$ 2.7
Scenario, Forecast [Member]
Schedule Of Operating Leases Square Footage [Line Items]
Lease square footage	55	167