Condensed Consolidated Statements of Cash Flow - USD ($) $ in Thousands	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Cash Flows from Operating Activities
Net income	$ 13,488	$ 13,243
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes	(1,366)	(648)
Remeasurement of preferred stock warrant liability	(9,071)	1,503
Inventory reserve	4,224	1,933
Stock-based compensation expense	2,038	610
Depreciation and amortization	2,270	1,461
Loss on disposal of property and equipment	131	27
Change in operating assets and liabilities:
Inventory	(24,208)	(10,142)
Prepaid expenses and other assets	4,084	(34)
Accounts payable	13,967	7,682
Accrued liabilities	16,942	21,119
Deferred revenue	1,663	2,173
Gift card liability	(119)	(48)
Other liabilities	748	2,725
Net cash provided by operating activities	24,791	41,604
Cash Flows from Investing Activities
Purchase of property and equipment	(4,180)	(5,478)
Proceeds from sale of property and equipment		31
Net cash used in investing activities	(4,180)	(5,447)
Cash Flows from Financing Activities
Proceeds from the exercise of stock options	444	206
Repurchase of common stock related to early exercised options	(39)
Payment of deferred offering costs	(528)
Net cash (used in) provided by financing activities	(123)	206
Net increase in cash and restricted cash	20,488	36,363
Cash and restricted cash at beginning of period	119,958	101,492
Cash and restricted cash at end of period	140,446	137,855
Components of cash and restricted cash
Cash	131,096	127,114
Restricted cash	250	1,391
Restricted cash, net of current portion	9,100	9,350
Cash and restricted cash at end of period	140,446	137,855
Supplemental Disclosure
Cash paid for income taxes		8,749
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Purchases of property and equipment included in accounts payable and accrued liabilities	1,022	4,303
Capitalized stock-based compensation	121	22
Vesting of early exercised options	315	$ 229
Deferred offering costs included in accounts payable and accrued liabilities	$ 920