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Preferred Stock Warrant Liability	12 Months Ended
Preferred Stock Warrant Liability	Aug. 03, 2019
Equity [Abstract]
Preferred Stock Warrant Liability	Preferred Stock Warrant Liability In 2012 and 2013, in connection with financing arrangements, we issued warrants to purchase shares of our convertible preferred stock. For one of the financing arrangements, we issued warrants to purchase 375,230 shares of Series Seed convertible preferred stock at an exercise price of $0.1066 per share and 66,265 shares of Series A convertible preferred stock at an exercise price of $0.22636 per share. For the second financing arrangement, we issued warrants for the purchase of, at the warrant holder’s option, either (a) 624,730 shares of Series A-1 convertible preferred stock at an exercise price of $0.2401 per share or (b) 308,315 shares of Series B convertible preferred stock at an exercise price of $0.486516 per share. Prior to their automatic exercise in connection with the IPO, the warrants were exercisable for and expired ten years from the date of issuance. In November 2017, in connection with our IPO, the preferred stock warrants were automatically exercised into shares of Class B common stock and the preferred stock warrant liability was reclassified to additional paid-in capital.