Zscaler (ZS) 10-Q 6 Mar 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jan. 31, 2019	Feb. 28, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	Zscaler, Inc.
Entity Central Index Key	1,713,683
Current Fiscal Year End Date	--07-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jan. 31, 2019
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Shares Outstanding		124,147,097

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 31, 2019	Jul. 31, 2018
Current assets:
Cash and cash equivalents	$ 67,467	$ 135,579
Short-term investments	272,476	162,960
Accounts receivable, net	75,470	61,611
Deferred contract acquisition costs	18,058	16,136
Prepaid expenses and other current assets	12,540	10,878
Total current assets	446,011	387,164
Property and equipment, net	25,762	19,765
Deferred contract acquisition costs, noncurrent	42,543	39,774
Other noncurrent assets	3,797	1,078
Total assets	518,113	447,781
Current liabilities:
Accounts payable	3,459	4,895
Accrued expenses and other current liabilities	13,934	12,313
Accrued compensation	15,541	23,393
Liability for early exercise of unvested stock options	972	1,561
Deferred revenue	176,326	140,670
Total current liabilities	210,232	182,832
Deferred revenue, noncurrent	29,694	23,353
Other noncurrent liabilities	1,114	1,360
Total liabilities	241,040	207,545
Commitments and contingencies (Note 6)
Stockholders’ Equity
Preferred stock; $0.001 par value; 200,000 shares authorized as of January 31, 2019 and July 31, 2018; no shares issued and outstanding as of January 31, 2019 and July 31, 2018	0	0
Common stock; $0.001 par value; 1,000,000 shares authorized as of January 31, 2019 and July 31, 2018; 123,897 and 119,764 shares issued and outstanding as of January 31, 2019 and July 31, 2018, respectively	124	119
Additional paid-in capital	483,951	438,392
Notes receivable from stockholders	0	(2,051)
Accumulated other comprehensive loss	(59)	(124)
Accumulated deficit	(206,943)	(196,100)
Total stockholders’ equity	277,073	240,236
Total liabilities and stockholders’ equity	$ 518,113	$ 447,781

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jan. 31, 2019	Jul. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	200,000,000	200,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	123,987,000	119,764,000
Common stock, shares outstanding (in shares)	123,987,000	119,764,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Income Statement [Abstract]
Revenue	$ 74,302	$ 44,976	$ 137,600	$ 84,837
Cost of revenue	15,271	8,679	27,370	16,950
Gross profit	59,031	36,297	110,230	67,887
Operating expenses:
Sales and marketing	38,756	27,110	75,301	54,038
Research and development	15,071	9,183	28,257	17,992
General and administrative	10,386	6,403	20,517	13,533
Total operating expenses	64,213	42,696	124,075	85,563
Loss from operations	(5,182)	(6,399)	(13,845)	(17,676)
Interest income, net	1,924	213	3,514	408
Other income, net	250	28	62	1
Loss before income taxes	(3,008)	(6,158)	(10,269)	(17,267)
Provision for income taxes	547	357	874	646
Net loss	(3,555)	(6,515)	(11,143)	(17,913)
Accretion of Series C and D redeemable convertible preferred stock	0	(2,579)	0	(5,109)
Net loss attributable to common stockholders	$ (3,555)	$ (9,094)	$ (11,143)	$ (23,022)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.03)	$ (0.29)	$ (0.09)	$ (0.74)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	122,741	31,434	121,664	31,125

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Statement of Comprehensive Income [Abstract]
Net loss	$ (3,555)	$ (6,515)	$ (11,143)	$ (17,913)
Other comprehensive income, net of tax:
Unrealized net gains on available-for-sale securities	258	0	65	0
Other comprehensive income	258	0	65	0
Comprehensive loss	$ (3,297)	$ (6,515)	$ (11,078)	$ (17,913)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Notes Receivable From Stockholders	Accumulated Other Comprehensive Loss	Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change	$ 0		$ 438			$ (438)
Redeemable convertible preferred stock, beginning balance (in shares) at Jul. 31, 2017	72,501,000
Redeemable convertible preferred stock, beginning balance at Jul. 31, 2017	$ 200,977
Increase (Decrease) in Temporary Equity [Roll Forward]
Accretion of Series C and D redeemable convertible preferred stock	$ 5,109
Redeemable convertible preferred stock, ending balance (in shares) at Jan. 31, 2018	72,501,000
Redeemable convertible preferred stock, ending balance at Jan. 31, 2018	$ 206,086
Common stock, beginning balance (in shares) at Jul. 31, 2017		32,359,000
Beginning balance at Jul. 31, 2017	(151,142)	$ 18	18,734	$ (7,878)	$ 0	(162,016)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		841,000
Issuance of common stock upon exercise of stock options	2,171	$ 1	2,170
Issuance of common stock related to early exercised stock options (in shares)		180,000
Issuance of common stock related to early exercised stock options	0
Vesting of early exercised stock options	1,015		1,015
Stock-based compensation	3,797		3,797
Net loss	(17,913)					(17,913)
Accretion of Series C and D redeemable convertible preferred stock	(5,109)		(5,109)
Repurchases of unvested common stock (in shares)		(549,000)
Repurchases of unvested common stock	214			214
Accrued interest on notes receivable from stockholders, net of repayments	(91)			(91)
Common stock, ending balance (in shares) at Jan. 31, 2018		32,831,000
Ending balance at Jan. 31, 2018	$ (167,058)	$ 19	21,045	(7,755)	0	(180,367)
Redeemable convertible preferred stock, beginning balance (in shares) at Oct. 31, 2017	72,501,000
Redeemable convertible preferred stock, beginning balance at Oct. 31, 2017	$ 203,507
Increase (Decrease) in Temporary Equity [Roll Forward]
Accretion of Series C and D redeemable convertible preferred stock	$ 2,579
Redeemable convertible preferred stock, ending balance (in shares) at Jan. 31, 2018	72,501,000
Redeemable convertible preferred stock, ending balance at Jan. 31, 2018	$ 206,086
Common stock, beginning balance (in shares) at Oct. 31, 2017		32,233,000
Beginning balance at Oct. 31, 2017	(161,410)	$ 19	20,133	(7,710)	0	(173,852)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		418,000
Issuance of common stock upon exercise of stock options	960		960
Issuance of common stock related to early exercised stock options (in shares)		180,000
Issuance of common stock related to early exercised stock options	0
Vesting of early exercised stock options	467		467
Stock-based compensation	2,064		2,064
Net loss	(6,515)					(6,515)
Accretion of Series C and D redeemable convertible preferred stock	(2,579)		(2,579)
Accrued interest on notes receivable from stockholders, net of repayments	(45)			(45)
Common stock, ending balance (in shares) at Jan. 31, 2018		32,831,000
Ending balance at Jan. 31, 2018	$ (167,058)	$ 19	21,045	(7,755)	0	(180,367)
Redeemable convertible preferred stock, beginning balance (in shares) at Jul. 31, 2018	0
Redeemable convertible preferred stock, beginning balance at Jul. 31, 2018	$ 0
Redeemable convertible preferred stock, ending balance (in shares) at Jan. 31, 2019	0
Redeemable convertible preferred stock, ending balance at Jan. 31, 2019	$ 0
Common stock, beginning balance (in shares) at Jul. 31, 2018	119,764,000	119,764,000
Beginning balance at Jul. 31, 2018	$ 240,236	$ 119	438,392	(2,051)	(124)	(196,100)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	3,511,000	3,511,000
Issuance of common stock upon exercise of stock options	$ 15,493	$ 4	15,489
Issuance of common stock related to early exercised stock options (in shares)		627,000
Issuance of common stock related to early exercised stock options	8,691	$ 1	8,690
Vesting of restricted stock units (in shares)		3,000
Vesting of restricted stock units	0
Adjustment to initial public offering costs	300		300
Vesting of early exercised stock options	567		567
Stock-based compensation	20,813		20,813
Other comprehensive income	65				65
Net loss	(11,143)					(11,143)
Repurchases of unvested common stock (in shares)		(8,000)
Repurchases of unvested common stock	0
Repayments of principal amount on notes receivable from stockholders	1,905			1,905
Accrued interest on notes receivable from stockholders, net of repayments	$ 146			146
Common stock, ending balance (in shares) at Jan. 31, 2019	123,987,000	123,897,000
Ending balance at Jan. 31, 2019	$ 277,073	$ 124	483,951	0	(59)	(206,943)
Redeemable convertible preferred stock, beginning balance (in shares) at Oct. 31, 2018	0
Redeemable convertible preferred stock, beginning balance at Oct. 31, 2018	$ 0
Redeemable convertible preferred stock, ending balance (in shares) at Jan. 31, 2019	0
Redeemable convertible preferred stock, ending balance at Jan. 31, 2019	$ 0
Common stock, beginning balance (in shares) at Oct. 31, 2018		122,106,000
Beginning balance at Oct. 31, 2018	252,178	$ 122	455,761	0	(317)	(203,388)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)		1,161,000
Issuance of common stock upon exercise of stock options	5,697	$ 1	5,696
Issuance of common stock related to early exercised stock options (in shares)		627,000
Issuance of common stock related to early exercised stock options	8,691	$ 1	8,690
Vesting of restricted stock units (in shares)		3,000
Vesting of restricted stock units	0
Adjustment to initial public offering costs	300		300
Vesting of early exercised stock options	277		277
Stock-based compensation	13,227		13,227
Other comprehensive income	258				258
Net loss	$ (3,555)					(3,555)
Common stock, ending balance (in shares) at Jan. 31, 2019	123,987,000	123,897,000
Ending balance at Jan. 31, 2019	$ 277,073	$ 124	$ 483,951	$ 0	$ (59)	$ (206,943)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Cash Flows From Operating Activities
Net loss	$ (11,143)	$ (17,913)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization expense	4,662	3,910
Amortization of acquired intangible assets	239	0
Amortization of deferred contract acquisition costs	8,781	5,932
Stock-based compensation expense	20,813	3,797
Accretion of purchase discounts, net of amortization of investment premiums	(1,125)	0
Other	202	(92)
Changes in operating assets and liabilities:
Accounts receivable	(13,859)	(8,482)
Deferred contract acquisition costs	(13,472)	(11,213)
Prepaid expenses and other assets	(2,778)	(1,094)
Accounts payable	(786)	(2,211)
Accrued expenses and other liabilities	1,042	445
Accrued compensation	(7,852)	(1,185)
Deferred revenue	41,997	22,638
Net cash provided by (used in) operating activities	26,721	(5,468)
Cash Flows From Investing Activities
Purchases of property, equipment and other	(8,607)	(7,045)
Capitalized internal-use software	(903)	(950)
Acquired intangible assets	(1,480)	0
Purchases of short-term investments	(179,896)	0
Proceeds from maturities of short-term investments	71,603	0
Net cash used in investing activities	(119,283)	(7,995)
Cash Flows From Financing Activities
Payments of offering costs related to initial public offering	(1,797)	(2,896)
Proceeds from issuance of common stock upon exercise of stock options	15,493	2,171
Proceeds from issuance of common stock related to early exercised stock options	0	869
Proceeds from issuance of common stock under the employee stock purchase plan	8,691	0
Repurchases of unvested common stock	(22)	(3,090)
Repayments of notes receivable from stockholders	1,905	0
Net cash provided by (used in) financing activities	24,270	(2,946)
Net decrease in cash, cash equivalents and restricted cash	(68,292)	(16,409)
Cash, cash equivalents and restricted cash at beginning of period	136,147	88,546
Cash, cash equivalents and restricted cash at end of period	67,855	72,137
Supplemental Disclosure of Cash Flow Information:
Cash paid for income taxes	1,121	267
Supplemental Disclosure of Noncash Investing and Financing Activities:
Net change in purchased equipment included in accounts payable and accrued expenses	1,544	(363)
Accretion of Series C and D redeemable convertible preferred stock	0	5,109
Repurchases of unvested common stock by cancellation of indebtedness	0	214
Vesting of early exercised common stock options	567	1,015
Net change in deferred offering costs accrued	(2,097)	203
Reconciliation of cash, cash equivalents and restricted cash within the condensed consolidated balance sheets to the amounts shown in the statements of cash flows above:
Total cash, cash equivalents and restricted cash	$ 136,147	$ 88,546

Business and Summary of Signifi

Business and Summary of Significant Accounting Policies	6 Months Ended
	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Summary of Significant Accounting Policies	Business and Summary of Significant Accounting Policies Description of the Business Zscaler, Inc. ("Zscaler," the "Company," "we," "us," or "our") is a cloud security company that developed a platform incorporating core security functionalities needed to enable users to safely utilize authorized applications and services based on an organization’s policies. Our solution is a purpose-built, multi-tenant, distributed cloud security platform that secures access for users and devices to applications and services, regardless of location. We deliver our solutions using a software-as-a-service ("SaaS") business model and sell subscriptions to customers to access our cloud platform, together with related support services. We were incorporated in Delaware in September 2007 and conduct business worldwide, with presence in North America, Europe and Asia. Our headquarters are in San Jose, California. Reverse Stock Split In March 2018, our board of directors approved an amendment to the Company's amended and restated certificate of incorporation effecting a 2-for-3 reverse stock split of the Company's issued and outstanding shares of common stock and convertible preferred stock. The reverse stock split was effected on March 1, 2018. All issued and outstanding share and per share amounts included in the accompanying condensed consolidated financial statements have been adjusted to reflect this reverse stock split for all periods presented. Initial Public Offering In March 2018, we completed our initial public offering ("IPO") of common stock, in which we sold 13,800,000 shares. The shares were sold at an IPO price of $16.00 per share for net proceeds of $205.3 million, after deducting underwriters' discounts and commissions of $15.5 million. In connection with the IPO, we incurred offering costs of $6.2 million which were recorded in stockholders’ equity as a reduction of the net proceeds received from the IPO. Immediately prior to the closing of the IPO, all our outstanding shares of convertible preferred stock were automatically converted into 72,500,750 shares of common stock on a one-to-one basis. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States ("U.S. GAAP") and applicable regulations of the Securities and Exchange Commission ("SEC") regarding interim financial reporting, and include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable required disclosures and regulations of the SEC. Therefore, these unaudited condensed consolidated financial statements and accompanying footnotes should be read in conjunction with the Company's audited consolidated financial statements and related notes in its Annual Report on Form 10-K for the fiscal year ended July 31, 2018 (the "Fiscal 2018 Form 10-K"), as filed with the SEC on September 13, 2018. Interim Unaudited Condensed Consolidated Financial Statements The accompanying condensed balance sheet as of July 31, 2018 was derived from the audited financial statements as of that date. The accompanying interim condensed consolidated financial statements, including the consolidated balance sheets as of January 31, 2019, the consolidated statements of operations for the three and six months ended January 31, 2019 and 2018, the consolidated statements of comprehensive loss for the three and six months ended January 31, 2019 and 2018, the consolidated statements of cash flows for the six months ended January 31, 2019 and 2018, the consolidated statement of redeemable convertible preferred stock and stockholders’ equity (deficit) for the three and six months ended January 31, 2019 and 2018 are unaudited. The related financial data and the other financial information disclosed in the accompanying notes to these condensed consolidated financial statements are also unaudited. These interim unaudited condensed consolidated financial statements have been prepared on a basis consistent with our annual consolidated financial statements and, in our opinion, include all normal recurring adjustments necessary to state fairly our quarterly results. The results of operations for the three and six months ended January 31, 2019 are not necessarily indicative of the results to be expected for the fiscal year ending July 31, 2019 or for any other future fiscal year or interim period. JOBS Act Extended Transition Period We are an emerging growth company ("EGC") as defined in the Jumpstart Our Business Startups Act of 2012 (the "JOBS Act"). As an EGC, the JOBS Act allows us to take advantage of specified reduced reporting requirements that are otherwise generally applicable to public companies, including, but not limited to, delayed adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. We have irrevocably elected not to avail ourselves of the extended transition periods available under the JOBS Act for complying with new and revised accounting standards and, therefore, we are subject to the same new or revised accounting standards as other public companies that are not emerging growth companies. As a result of our transition to large accelerated filer status as of July 31, 2019, we will cease to qualify as an emerging growth company and will no longer have the option to take advantage of the extended transition period. Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgments and assumptions that affect the amounts reported and disclosed in the financial statements and accompanying notes. Such estimates include, but are not limited to, the determination of revenue recognition, deferred revenue, deferred contract acquisition costs, valuation of acquired intangible assets, the period of benefit generated from our deferred contract acquisition costs, allowance for doubtful accounts, valuation of common stock options and stock-based awards, useful lives of property and equipment, useful lives of acquired intangible assets, loss contingencies related to litigation and valuation of deferred tax assets. Management determines these estimates and assumptions based on historical experience and on various other assumptions that are believed to be reasonable. Actual results could differ significantly from these estimates, and such differences may be material to the condensed consolidated financial statements. Fiscal Year Our fiscal year ends on July 31. References to fiscal 2019, for example, refer to our fiscal year ending July 31, 2019. Significant Accounting Policies Our significant accounting policies are discussed in the "Index to Consolidated Financial Statements, Note 1. Business and Summary of Significant Accounting Policies" in the Fiscal 2018 Form 10-K. There have been no significant changes to these policies that have had a material impact on our condensed consolidated financial statements and related notes for the three and six months ended January 31, 2019. The following describes the impact of certain policies. Revenue Recognition We adopted Accounting Standards Codification ("ASC") Topic 606, Revenue From Contracts With Customers ("ASC 606") on August 1, 2017, using the full retrospective transition method. Disaggregation of Revenue Subscription and support revenue is recognized over time and accounted for approximately 97% and 99% of our revenue for the three months ended January 31, 2019 and 2018, respectively, and approximately 98% of our revenue for the six months ended January 31, 2019 and 2018. The following table summarizes the revenue by region based on the shipping address of customers who have contracted to use our cloud platform: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 Amount % Revenue Amount % Revenue Amount % Revenue Amount % Revenue (in thousands, except per percentage data) United States $ 37,626 51 % $ 20,224 45 % $ 67,433 49 % $ 39,985 47 % Europe, Middle East and Africa (*) 29,552 40 % 20,168 45 % 56,946 41 % 37,154 44 % Asia Pacific 5,674 7 % 3,465 8 % 10,463 8 % 6,554 8 % Other 1,450 2 % 1,119 2 % 2,758 2 % 1,144 1 % Total $ 74,302 100 % $ 44,976 100 % $ 137,600 100 % $ 84,837 100 % (*) Revenue from the United Kingdom ("U.K.") represented 10% and 12% of our revenue for the three months ended January 31, 2019 and 2018, respectively, and 10% and 11% for the six months ended January 31, 2019 and 2018, respectively. The following table summarizes the revenue from contracts by type of customer: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 Amount % Revenue Amount % Revenue Amount % Revenue Amount % Revenue (in thousands, except per percentage data) Channel partners $ 71,074 96 % $ 41,258 92 % $ 131,093 95 % $ 77,429 91 % Direct customers 3,228 4 % 3,718 8 % 6,507 5 % 7,408 9 % Total $ 74,302 100 % $ 44,976 100 % $ 137,600 100 % $ 84,837 100 % Contract Balances Contract liabilities consist of deferred revenue and include payments received in advance of performance under the contract. Such amounts are recognized as revenue over the contractual period. For the six months ended January 31, 2019 and 2018, we recognized revenue of $68.2 million and $58.6 million, respectively, that was included in the corresponding contract liability balance at the beginning of these periods. Remaining Performance Obligations The typical subscription and support term is one to three years. Most of our subscription and support contracts are non-cancelable over the contractual term. However, customers typically have the right to terminate their contracts for cause, if we fail to perform. As of January 31, 2019, the aggregate amount of the transaction price allocated to remaining performance obligations was $461.0 million. We expect to recognize 55% of the transaction price over the next 12 months and 98% of the transaction price over the next three years, with the remainder recognized thereafter. Costs to Obtain and Fulfill a Contract We capitalize sales commissions and associated payroll taxes paid to internal sales personnel that are incremental to the acquisition of channel partner and direct customer contracts. These costs are recorded as deferred contract acquisition costs in the condensed consolidated balance sheets. The following table summarizes the activity of the deferred contract acquisition costs: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 (in thousands) Beginning balance $ 55,978 $ 36,002 $ 55,910 $ 34,662 Capitalization of contract acquisition costs 9,080 7,005 13,472 11,213 Amortization of deferred contract acquisition costs (4,457) (3,064) (8,781) (5,932) Ending balance $ 60,601 $ 39,943 $ 60,601 $ 39,943 As of the end of the period: Deferred contract acquisition costs, current $ 18,058 $ 12,271 $ 18,058 $ 12,271 Deferred contract acquisition costs, noncurrent 42,543 27,672 42,543 27,672 Total deferred contract acquisition costs $ 60,601 $ 39,943 $ 60,601 $ 39,943 Sales commissions accrued but not paid as of January 31, 2019 and July 31, 2018, totaled $4.6 million and $10.0 million, respectively, which are included within accrued compensation in the condensed consolidated balance sheets. Deferred Offering Costs Deferred offering costs consisted of fees and expenses incurred in connection with our IPO, including legal, accounting, printing and other IPO-related costs. Total deferred offering costs of $6.2 million were reclassified to stockholders' equity (deficit) as a reduction of the net proceeds received from the IPO. Recently Adopted Accounting Pronouncements In January 2017, the Financial Accounting Standard Board ("FASB") issued Accounting Standard Update ("ASU") No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The amendment was issued to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions of assets or businesses. This standard provides a screen test to determine when a set (inputs and processes that produce an output) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. We adopted this standard as of August 1, 2018, and it did not have a material impact to our consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting , which provides clarity in applying the guidance in Topic 718 around modifications of share-based payment awards. We adopted this standard as of August 1, 2018, and it did not have a material impact to our consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . The new standard eliminates the diversity in practice related to the classification of certain cash receipts and payments for debt prepayment or extinguishment costs, the maturing of a zero-coupon bond, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, distributions from certain equity method investees and beneficial interests obtained in a financial asset securitization. We adopted this standard as of August 1, 2018 using the retrospective transition method, and it did not have a material impact to our consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash , which requires that amounts generally described as restricted cash or restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. We adopted this standard as of August 1, 2018 using the retrospective transition method and we have adjusted our prior period condensed consolidated statement of cash flows to conform to the current presentation. In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting , which simplifies the accounting for equity awards granted to nonemployees. For public business entities, it is effective for fiscal years beginning after December 15, 2018, and interim periods therein. Early adoption is permitted. We early adopted this standard as of August 1, 2018 using the prospective transition method, which resulted in a cumulative-effect adjustment of $0.3 million recognized within stockholders' equity, as a reduction of additional paid-in capital against accumulated deficit, on the adoption date. In August 2018, the FASB issued ASU No. 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ,” which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The new standard requires capitalized costs to be amortized on a straight-line basis generally over the term of the arrangement, and the financial statement presentation for these capitalized costs would be the same as that of the fees related to the hosting arrangements. For public business entities, this standard is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. We early adopted this standard as of August 1, 2018 using the prospective transition method, and it did not have a material impact to our consolidated financial statements. In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, " Disclosure Update and Simplification ," amending certain disclosure requirements that have become redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. The final rule is effective November 5, 2018. We early adopted this requirement as of August 1, 2018, presenting the activity of the stockholder's equity accounts in the accompanying condensed statements of redeemable convertible preferred stock and stockholders' equity (deficit) for the periods presented. Recently Issued Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"), which requires lessees to recognize most leases on their balance sheets that do not meet the definition of a short-term lease but recognize the expenses on their statements of operations in a manner similar to current accounting rules. In July 2018, the FASB issued ASU 2018-10, Leases (Topic 842), Codification Improvements ("ASU 2018-10"), which clarifies certain adoption provisions of the new leases standard such as the application of implicit rate, lessee reassessment of lease classification and certain transition adjustments. In addition, in July 2018, the FASB issued ASU 2018-11, Leases (Topic 842), Targeted Improvements ("ASU 2018-11"), which allows for the adoption of ASU 2016-02 to be applied at the beginning of the year of adoption, as opposed to at the beginning of the earliest year presented in the financial statements. These standards are effective for fiscal years beginning after December 15, 2018, with early adoption permitted. We are currently evaluating the effect of these standards; however, we anticipate the most significant effects will relate to the recognition of right-of-use assets and lease liabilities arising from our real estate and data center operating leases that do not meet the definition of a short-term lease on the adoption date and providing qualitative and quantitative disclosures in the notes to the condensed consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . This ASU amends guidance on reporting credit losses for assets held at amortized cost basis and available-for-sale debt securities to require that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The measurement of credit losses for newly recognized financial assets and subsequent changes in the allowance for credit losses are recorded in the statements of operations. For public business entities, it is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the potential impact of this standard on our consolidated financial statements.

Cash Equivalents and Short-Term

Cash Equivalents and Short-Term Investments	6 Months Ended
	Jan. 31, 2019
Cash and Cash Equivalents [Abstract]
Cash Equivalents and Short-Term Investments	Cash Equivalents and Short-Term Investments Cash equivalents and short-term investments consisted of the following as of January 31, 2019: Amortized Unrealized Unrealized (in thousands) Cash equivalents: Money market funds $ 49,405 $ — $ — $ 49,405 U.S. treasury securities 4,993 — (1) 4,992 Total cash equivalents $ 54,398 $ — $ (1) $ 54,397 Short-term investments: U.S. treasury securities $ 130,212 $ 13 $ (15) $ 130,210 U.S. government agency securities 44,399 3 (44) 44,358 Corporate debt securities 97,923 50 (65) 97,908 Total short-term investments $ 272,534 $ 66 $ (124) $ 272,476 Total cash equivalents and short-term investments $ 326,932 $ 66 $ (125) $ 326,873 Cash equivalents and short-term investments consisted of the following as of July 31, 2018: Amortized Unrealized Unrealized (in thousands) Cash equivalents: Money market funds $ 74,408 $ — $ — $ 74,408 U.S. treasury securities 17,488 — — 17,488 U.S. government agency securities 1,999 — — 1,999 Corporate debt securities 11,010 — (1) 11,009 Total cash equivalents $ 104,905 $ — $ (1) $ 104,904 Short-term investments: U.S. treasury securities $ 55,768 $ — $ (17) $ 55,751 U.S. government agency securities 17,953 — (19) 17,934 Corporate debt securities 89,362 1 (88) 89,275 Total short-term investments $ 163,083 $ 1 $ (124) $ 162,960 Total cash equivalents and short-term investments $ 267,988 $ 1 $ (125) $ 267,864 The amortized cost and fair value of our short-term investments based on their stated maturities consisted of the following as of January 31, 2019: Amortized Fair Value (in thousands) Due within one year $ 213,194 $ 213,163 Due between one and two years 59,340 59,313 Total short-term investments $ 272,534 $ 272,476 Short-term investments that were in an unrealized loss position consisted of the following as of January 31, 2019: Less than 12 Months Greater than 12 Months Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) U.S. treasury securities $ 83,321 $ (15) $ — $ — $ 83,321 $ (15) U.S. government agency securities 35,588 (44) — — 35,588 (44) Corporate debt securities 72,855 (65) — — 72,855 (65) Total investments in a loss position $ 191,764 $ (124) $ — $ — $ 191,764 $ (124) Short-term investments that were in an unrealized loss position consisted of the following as of July 31, 2018: Less than 12 Months Greater than 12 Months Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) U.S. treasury securities $ 55,750 $ (17) $ — $ — $ 55,750 $ (17) U.S. government agency securities 17,934 (19) — — 17,934 (19) Corporate debt securities 83,332 (88) — — 83,332 (88) Total investments in a loss position $ 157,016 $ (124) $ — $ — $ 157,016 $ (124) We review the individual securities that have unrealized losses in our short-term investment portfolio on a regular basis to evaluate whether or not any security has experienced an other-than-temporary decline in fair value. We evaluate, among others, whether we have the intention to sell any of these investments and whether it is more likely than not that we will be required to sell any of them before recovery of the amortized cost basis. Based on this evaluation, we determined that there were no other-than-temporary impairments associated with our short-term investments as of January 31, 2019 and July 31, 2018.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jan. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We measure our financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Our money market funds are classified within Level I due to the highly liquid nature of these assets which also have quoted prices in active markets. Certain of our investments in available-for-sale securities (i.e., U.S. treasury securities, U.S. government agency securities and corporate debt securities) are classified within Level II. The fair value of these securities is priced by using inputs based on non-binding market consensus prices that are primarily corroborated by observable market data or quoted market prices for similar instruments. Assets that are measured at fair value on a recurring basis consisted of the following as of January 31, 2019: Level I Level II Level III Total Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Cash equivalents: Money market funds $ 49,405 $ 49,405 $ — $ — U.S. treasury securities 4,992 — 4,992 — Total cash equivalents $ 54,397 $ 49,405 $ 4,992 $ — Short-term investments: U.S. treasury securities $ 130,210 $ — $ 130,210 $ — U.S. government agency securities 44,358 — 44,358 — Corporate debt securities 97,908 — 97,908 — Total short-term investments $ 272,476 $ — $ 272,476 $ — Assets that are measured at fair value on a recurring basis consisted of the following as of July 31, 2018: Level I Level II Level III Total Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Cash equivalents: Money market funds $ 74,408 $ 74,408 $ — $ — U.S. treasury securities 17,488 — 17,488 — U.S. government agency securities 1,999 — 1,999 — Corporate debt securities 11,009 — 11,009 — Total cash equivalents $ 104,904 $ 74,408 $ 30,496 $ — Short-term investments: U.S. treasury securities $ 55,751 $ — $ 55,751 $ — U.S. government agency securities 17,934 — 17,934 — Corporate debt securities 89,275 — 89,275 — Total short-term investments $ 162,960 $ — $ 162,960 $ — We did not have transfers between levels of the fair value hierarchy of assets measured at fair value during the periods presented.

Property and Equipment

Property and Equipment	6 Months Ended
	Jan. 31, 2019
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and equipment consisted of the following: January 31, 2019 July 31, 2018 (in thousands) Hosting equipment $ 39,960 $ 30,743 Computers and equipment 2,573 2,335 Purchased software 1,314 1,324 Capitalized internal-use software 7,066 6,163 Furniture and fixtures 1,514 1,478 Leasehold improvements 2,123 2,123 Property and equipment, gross 54,550 44,166 Less: Accumulated depreciation and amortization (28,788) (24,401) Total property and equipment, net $ 25,762 $ 19,765 Depreciation and amortization expense on property and equipment was $2.5 million and $2.0 million for the three months ended January 31, 2019 and 2018, respectively, and $4.7 million and $3.9 million for the six months ended January 31, 2019 and 2018, respectively.

Acquired Intangible Assets, Net

Acquired Intangible Assets, Net	6 Months Ended
	Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Acquired Intangible Assets, Net	Acquired Intangible Assets, Net Acquired intangible assets consist of developed technology and are included within other noncurrent assets in the condensed consolidated balance sheets. As of January 31, 2019, acquired intangible assets have a weighted-average remaining useful life of 2.6 years and are amortized on a straight-line basis. Amortization expense of acquired intangible assets was $0.1 million for the three months ended January 31, 2019 and $0.2 million for the six months ended January 31, 2019. We did not have acquired intangible assets prior to fiscal 2019. The gross carrying amount and accumulated amortization of acquired intangible assets consisted of the following as of January 31, 2019: Gross Carrying Amount Accumulated Amortization Net Book Value (in thousands) Developed technology $ 1,716 $ (239) $ 1,477 Future amortization expense of acquired intangible assets consisted of the following as of January 31, 2019: Amortization Year ending July 31, (in thousands) 2019 (remaining six months) $ 286 2020 572 2021 572 2022 47 Total $ 1,477

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jan. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases We lease our office space under various operating lease agreements expiring at various dates through August 2021. Future minimum payments under our non-cancelable operating leases consisted of the following as of January 31, 2019: Operating (in thousands) Year ending July 31, 2019 (remaining six months) $ 1,578 2020 2,588 2021 1,604 2022 18 Total $ 5,788 Rent expense was $0.8 million and $0.6 million for the three months ended January 31, 2019 and 2018, respectively, and $1.4 million and $1.1 million for the six months ended January 31, 2019 and 2018, respectively. Data Center Contract Commitments We enter into long-term non-cancelable agreements with providers in various countries to purchase data center capacity, such as bandwidth and colocation space, for our cloud platform. Future minimum payments under our non-cancelable data center contracts consisted of the following as of January 31, 2019: Data Center Contracts (in thousands) Year ending July 31, 2019 (remaining six months) $ 4,416 2020 6,710 2021 4,131 2022 933 Total $ 16,190 Bandwidth and colocation expenses are recognized as cost of revenue and were $3.4 million and $2.2 million for the three months ended January 31, 2019 and 2018, respectively, and $6.4 million and $4.3 million for the six months ended January 31, 2019 and 2018, respectively. Non-cancelable Purchase Obligations In the normal course of business, we enter into non-cancelable purchase commitments with various parties to purchase products and services such as technology equipment, subscription-based cloud service arrangements, corporate events and consulting services. As of January 31, 2019 and July 31, 2018, we had outstanding non-cancelable purchase obligations with a term of 12 months or longer of $3.7 million and $3.1 million, respectively.
Legal Matters	Legal Matters Symantec Litigation We are currently involved in legal proceedings with Symantec. On December 12, 2016, Symantec filed a complaint, which we refer to as Symantec Case 1, in the U.S. District Court for the District of Delaware alleging that "Zscaler’s cloud security platform" infringes U.S. Patent Nos. 6,279,113, 7,203,959 ("’959 patent"), 7,246,227 ("’227 patent"), 7,392,543, 7,735,116, 8,181,036 and 8,661,498. The complaint seeks compensatory damages, an injunction, enhanced damages and attorney fees. On August 2, 2017, the court granted our motion to transfer Symantec Case 1 from the District of Delaware to the Northern District of California. On March 23, 2018, the Northern District of California court granted our motion to dismiss the asserted claims of the ’959 and ’227 patents as invalid based on unpatentable subject matter. On April 18, 2017, Symantec filed a second complaint, which we refer to as Symantec Case 2, in the U.S. District Court for the District of Delaware alleging that "Zscaler’s cloud security platform" infringes U.S. Patent Nos. 6,285,658 ("’658 patent"), 7,360,249 ("’249 patent"), 7,587,488, 8,316,429 ("’429 patent"), 8,316,446 ("’446 patent"), 8,402,540 and 9,525,696 ("’696 patent"). The complaint seeks compensatory damages, an injunction, enhanced damages and attorney fees. On June 22, 2017, Symantec filed a notice of voluntary dismissal of its complaint in Symantec Case 2 along with a new complaint alleging infringement of the same patents and adding Symantec Limited as a plaintiff and alleging willful infringement of the ’429 and ’446 patents. On July 31, 2017, the court granted our motion to transfer Symantec Case 2 from the District of Delaware to the Northern District of California. On May 21, 2018, Symantec filed an amended complaint adding allegations of willful infringement of all of the asserted patents in Symantec Case 2. On December 12, 2018, Symantec filed a notice of voluntary dismissal with prejudice of the ’658, ’249, and ’696 Patents asserted in Symantec Case 2. We have also received letters from Symantec alleging that our "cloud security platform" infringes U.S. Patent Nos. 7,031,327, 7,496,661, 7,543,036 and 7,624,110. We believe that our technology does not infringe Symantec’s asserted patents and that these patents are invalid. Should Symantec prevail with its infringement allegations, we could be required to pay substantial damages for past and future sales and/or licensing of our services, enjoined from making, using, selling or otherwise disposing of our services if a license or other right to continue selling our services is not made available to us, and required to pay substantial ongoing royalties and comply with unfavorable terms if such a license is made available to us. Any of these outcomes could result in a material adverse effect on our business. Even if we were to prevail, this litigation could be costly and time-consuming, divert the attention of our management and key personnel from our business operations, deter distributors from selling or licensing our services, and dissuade potential customers from purchasing our services, which would also materially harm our business. The expense of litigation and the timing of this expense from period to period are difficult to estimate, subject to change and could adversely affect our results of operations. In addition, any public announcements of the results of any proceedings in Symantec Case 1 or Case 2 could be negatively perceived by industry or financial analysts and investors, and could cause our stock price to experience volatility or decline. We have not recorded a liability with respect to Symantec Case 1 or Case 2 based on our determination that a loss in either case is not probable under the applicable accounting standards. We are vigorously defending Symantec Case 1 and Case 2. We are unable to predict the likelihood of success of Symantec’s infringement claims. Finjan Litigation We are currently involved in legal proceedings with Finjan. On December 5, 2017, Finjan filed a complaint, in the U.S. District Court for the Northern District of California alleging that Zscaler’s "Internet Access Bundles," "Private Access Bundle," "Zscaler Enforcement Node," "Secure Web Gateway," "Cloud Firewall," "Cloud Sandbox" and "Cloud Architecture products and services" infringe U.S. Patent Nos. 6,804,780, 7,647,633, 8,677,494 and 7,975,305. The complaint seeks compensatory damages, an injunction, enhanced damages and attorney fees. We believe our technology does not infringe Finjan’s asserted patents and that Finjan’s patents are invalid. Should Finjan prevail with its infringement allegations, we could be required to pay substantial damages for past and future sales and/or licensing of our services, enjoined from making, using, selling or otherwise disposing of our services if a license or other right to continue selling our services is not made available to us, and required to pay substantial ongoing royalties and comply with unfavorable terms if such a license is made available to us. Any of these outcomes could result in a material adverse effect on our business. Even if we were to prevail, this litigation could be costly and time-consuming, divert the attention of our management and key personnel from our business operations, deter distributors from selling or licensing our services, and dissuade potential customers from purchasing our services, which would also materially harm our business. The expense of litigation and the timing of this expense from period to period are difficult to estimate, subject to change and could adversely affect our results of operations. In addition, any public announcements of the results of any proceedings in this matter could be negatively perceived by industry or financial analysts and investors, and could cause our stock price to experience volatility or decline. While the range of potential loss resulting from the lawsuit cannot be reasonably estimated, we have accrued a total liability of $3.2 million as of January 31, 2019 related to past negotiations with Finjan of which we recognized $0.7 million in fiscal 2018 and $2.5 million in fiscal 2017. We are vigorously defending this lawsuit. We are unable to predict the likelihood of success of Finjan’s infringement claims. Other Litigation and Claims In addition, from time to time we are a party to various litigation matters and subject to claims that arise in the ordinary course of business, including patent, commercial, product liability, employment, class action, whistleblower and other litigation and claims, as well as governmental and other regulatory investigations and proceedings. In addition, third parties may from time to time assert claims against us in the form of letters and other communications. Except as otherwise described above, there is no pending or threatened legal proceeding to which we are a party that, in our opinion, is likely to have a material adverse effect on our future financial results or operations; however, the results of litigation and claims are inherently unpredictable. Regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors. The expense of litigation and the timing of this expense from period to period are difficult to estimate, subject to change and could adversely affect our results of operations.

Preferred Stock

Preferred Stock	6 Months Ended
	Jan. 31, 2019
Temporary Equity Disclosure [Abstract]
Preferred Stock	Preferred Stock Upon completion of our IPO, as further described in Note 1, all shares of convertible preferred stock then outstanding, totaling 72,500,750 shares, were automatically converted into an equivalent number of shares of common stock on a one-to-one basis and their carrying value, totaling $207.3 million, inclusive of accretion of Series C and D redeemable convertible preferred stock of $24.7 million, was reclassified to stockholders' equity (deficit). Prior to the IPO, we recognized accretion to the redemption price of Series C and D redeemable convertible preferred stock. Accretion was recognized as a reduction of additional paid-in capital with a corresponding increase to the carrying value of Series C and D redeemable convertible preferred stock. Upon completion of the IPO, the accretion rights of Series C

Common Stock

Common Stock	6 Months Ended
	Jan. 31, 2019
Equity [Abstract]
Common Stock	Common Stock Holders of our common stock are entitled to one vote for each share of common stock held and are not entitled to receive dividends unless declared by our board of directors. Shares of common stock reserved for future issuance consisted of the following as of January 31, 2019: Underlying Shares (in thousands) Equity awards outstanding: Stock options 12,028 Unvested restricted stock units 3,037 Unvested performance stock units, based on the target number of shares granted (*) 1,460 Purchase rights committed under the employee stock purchase plan 1,410 Equity awards available for future grants: Equity incentive plans 15,815 Employee stock purchase plan 1,361 Total reserved shares of common stock for future issuance 35,111 (*) Holders of performance stock units corresponding to fiscal 2019, as further described in Note 9, have the ability to receive up to 150% of the target number of shares granted if the maximum achievement of target performance metrics is attained.

Stock Based Compensation

Stock Based Compensation	6 Months Ended
	Jan. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Equity Incentive Plans We adopted the Fiscal Year 2018 Equity Incentive Plan (the "2018 Plan") in fiscal 2018 and the 2007 Stock Plan (the "2007 Plan") in fiscal 2008, collectively referred to as the "Plans." Equity incentive awards granted under the Plans may be either restricted stock units, restricted stock, stock options, nonstatutory stock options, stock appreciation rights, performance units and performance shares to our employees, directors, officers and consultants. In March 2018, in connection with our IPO, the 2007 Plan was terminated along with its remaining balance of shares of common stock available for grant. With the establishment of the 2018 Plan, we no longer grant stock-based awards under the 2007 Plan and any shares underlying stock options that expire or terminate or are forfeited or repurchased by us under the 2007 Plan will be automatically transferred to the 2018 Plan. As of January 31, 2019, we have reserved a total of approximately 18,688,000 shares of common stock for the issuance of equity awards under the 2018 Plan, of which approximately 15,815,000 shares were available for grant on such date. Stock Options Under the Plans, the exercise price of a stock option grant must not be less than 100% of the fair market value of the common stock on the date of grant. Generally, stock options vest over four years with 25% of the option shares vesting one year from the date of grant and monthly thereafter over the remaining vesting term. Stock options granted under the 2018 Plan and 2007 Plan are exercisable over a maximum term of ten years and seven years, respectively, from the date of grant. Stock options that are forfeited or canceled shall become available for future grant or sale under the 2018 Plan. The activity of stock options consisted of the following: Outstanding Weighted-Average Weighted-Average Aggregate (in thousands, except per share amounts) Balance as of July 31, 2018 16,175 $ 6.20 5.1 $ 470,860 Stock options exercised (3,511) $ 4.41 $ 129,596 Stock options canceled, forfeited or expired (636) $ 6.22 Balance as of January 31, 2019 12,028 $ 6.72 4.9 $ 500,853 Exercisable and expected to vest as of July 31, 2018 5,499 $ 3.97 4.0 $ 172,317 Exercisable and expected to vest as of January 31, 2019 4,055 $ 4.52 4.0 $ 177,830 The aggregate intrinsic value of the stock options exercised represents the difference between the fair value of our common stock on the date of exercise and their exercise price. The total intrinsic value of options exercised for the six months ended January 31, 2019 and 2018 was $129.6 million and $5.2 million, respectively. The weighted-average grant-date fair value per share of stock options granted for the six months ended January 31, 2018 was $3.12. Since our IPO, we have not granted additional stock options. We estimated the fair value of employee stock option using the Black-Scholes option pricing model with the following assumptions. Six Months Ended January 31, 2018 Expected term (in years) 4.6 Expected stock price volatility 40.4% - 41.5% Risk-free interest rate 1.7% - 2.6% Dividend yield 0.0% Restricted Stock Units The 2018 Plan allows for the grant of restricted stock units ("RSUs"). Generally, RSUs are subject to a four-year vesting period, with 25% of the shares vesting one year from the date of grant and quarterly thereafter over the remaining vesting term. We began granting RSUs in the fourth quarter of fiscal 2018. The activity of RSUs consisted of the following: RSUs Outstanding Weighted-Average Grant Date Fair Value per Share Aggregate (in thousands, except per share amounts) Balance as of July 31, 2018 209 $ 26.26 $ 7,394 Granted 2,888 $ 40.20 Vested (3) $ 44.26 $ 111 Canceled, forfeited (57) $ 40.36 Balance as of January 31, 2019 3,037 $ 39.23 $ 146,897 Performance Stock Units The 2018 Plan allows for the grant of performance stock units ("PSUs"). During the six months ended January 31, 2019, the compensation committee of our board of directors approved the grant of PSUs to certain members of our executive team corresponding to the performance periods of fiscal 2019, 2020, 2021 and 2022. In addition, the compensation committee determined and approved the corporate performance metrics for fiscal 2019. The corporate performance metrics corresponding to future fiscal years will be determined and approved in the future for each corresponding fiscal year. Holders of PSUs corresponding to the performance period of fiscal 2019 have the ability to receive up to 150% of the target number of shares granted if maximum achievement of target performance metrics is achieved. The right to receive such awards is subject to achievement of the defined corporate performance metrics corresponding for each fiscal year and continuous service by the employee. Any earned awards are subject to additional time-based vesting in accordance with the respective award agreement. Since the performance conditions of future fiscal years have not been established as of January 31, 2019, these awards are not considered granted for accounting purposes. Therefore, we have not recognized stock-based compensation expense for PSUs corresponding to fiscal years beyond 2019. The number of unvested PSUs outstanding based on the target number of shares granted consisted of the following as of January 31, 2019: Underlying Shares Performance periods (in thousands) Fiscal 2019 464 Fiscal 2020 464 Fiscal 2021 150 Fiscal 2022 150 Total 1,228 The activity of PSUs for which performance conditions have been established and are expected to be earned consisted of the following: Underlying Shares Weighted-Average Grant Date Fair Value per Share Aggregate (in thousands, except for share amounts) Balance as of July 31, 2018 — — $ — Granted 464 $ 36.90 Vested — — $ — Canceled, forfeited — — Balance as of January 31, 2019 464 $ 36.90 $ 22,456 Employee Stock Purchase Plan We adopted the Fiscal Year 2018 Employee Stock Purchase Plan (the "ESPP") in the third quarter of fiscal 2018. As of January 31, 2019, a total of 3,397,643 shares of common stock were reserved for issuance under the ESPP. The ESPP provides eligible employees with an opportunity to purchase shares of our common stock through payroll deductions of up to 15% of their eligible compensation. A participant may purchase a maximum of 3,000 shares of common stock during a purchase period. The purchase price of the shares shall be 85% of the lower of the fair market value of our common stock on (i) the first trading day of the applicable offering period and (ii) the last trading day of each purchase period in the related offering period. The ESPP provides for consecutive offering periods that will typically have a duration of approximately 24 months in length and is comprised of four purchase periods of approximately six ESPP employee payroll contributions accrued at January 31, 2019 and July 31, 2018, totaled $2.2 million and $4.6 million, respectively, and are included within accrued compensation in the condensed consolidated balance sheets. Employee payroll contributions ultimately used to purchase shares under the ESPP will be reclassified to stockholders' equity on the purchase date. The fair value of the purchase right for the ESPP is estimated on the date of grant using the Black-Scholes model with the following assumptions: Six Months Ended January 31, 2019 Expected term (in years) 0.5 - 2.0 Expected stock price volatility 44.0% - 61.9% Risk-free interest rate 2.5% - 2.7% Dividend yield 0.0% Early Exercise of Employee Options The 2007 Plan allowed for the early exercise of stock options for certain individuals as determined by the board of directors. The consideration received for an early exercise of an option is considered to be a deposit of the exercise price and is reflected as liability in the condensed consolidated balance sheets and reclassified to additional paid-in capital as the awards vest. Upon an employee’s termination, we have the option to repurchase unvested shares at a price per share equal to the lesser of the fair market value of the shares at the time of the repurchase or the original purchase price. During the six months ended January 31, 2019 and 2018, we reclassified to additional paid-in capital $0.6 million and $1.0 million, respectively, related to awards vested during these periods. As of January 31, 2019 and July 31, 2018, the number of shares of common stock subject to repurchase was 238,662 shares and 422,528 shares with an aggregate purchase price of $1.0 million and $1.6 million, respectively. Notes Receivable from Stockholders Prior to fiscal 2017, we entered into notes receivable agreements with certain of our current and former executives and employees in connection with the exercise of their stock options. The outstanding principal amount and related accrued interest on the notes are presented as contra-equity in the condensed consolidated balance sheets until the notes are fully settled. As of July 31, 2018, the carrying amount of the outstanding notes receivable, inclusive of accrued interest of $0.1 million, was $2.1 million. During the six months ended January 31, 2019, the principal amount and accrued interest of the outstanding notes were fully repaid, resulting in cash proceeds of $2.1 million. Stock-based Compensation Expense The components of stock-based compensation expense recognized in the condensed consolidated statements of operations consisted of the following: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 (in thousands) Cost of revenue $ 619 $ 126 1,122 $ 235 Sales and marketing 5,517 985 8,318 1,770 Research and development 4,398 494 7,193 892 General and administrative 2,693 459 4,180 900 Total stock-based compensation expense $ 13,227 $ 2,064 $ 20,813 $ 3,797 As of January 31, 2019, the unrecognized stock-based compensation cost was $148.5 million, which we expect to amortize over a weighted-average period of 3.5 years.

Income Taxes

Income Taxes	6 Months Ended
	Jan. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our tax provision for interim periods is determined using an estimate of our annual effective tax rate, adjusted for discrete items, if any, that arise during the period. Each quarter, we update our estimate of the annual effective tax rate, and if the estimated annual effective tax rate changes, we make a cumulative adjustment in such period. Our quarterly tax provision, and estimate of our annual effective tax rate, is subject to variation due to several factors, including variability in pre-tax income (or loss), the mix of jurisdictions to which such income relates, changes in how we do business, and tax law developments. Our estimated annual effective tax rate for the year differs from the U.S. statutory rate of 21% primarily due to the earnings of our foreign subsidiaries being taxed at rates higher than the U.S. statutory rate. We recorded a provision for income taxes of $0.5 million and $0.4 million for the three months ended January 31, 2019 and 2018, respectively, and $0.9 million and $0.6 million for the six months ended January 31, 2019 and 2018, respectively. We are subject to income tax in the U.S. as well as other tax jurisdictions in which we conduct business. Earnings from our non-U.S. operations are subject to income taxes in the countries in which we operate. Our provision for income taxes consists primarily of both income and withholding taxes in the foreign jurisdictions in which we conduct business. The realization of deferred tax assets is dependent upon the generation of sufficient taxable income of the appropriate character in future periods. We assess our ability to realize the deferred tax assets on a quarterly basis and we establish a valuation allowance if it is more-likely-than-not that some portion of the deferred tax assets will not be realized. We weigh all available positive and negative evidence, including our earnings history and results of recent operations, scheduled reversals of deferred tax liabilities, projected future taxable income and tax planning strategies. Due to the weight of objectively verifiable negative evidence, including our history of losses in certain jurisdictions, we believe that it is more likely than not that our U.S. federal and state deferred tax assets will not be realized. Accordingly, we have maintained a valuation allowance on our U.S. federal and state deferred tax assets. During the three months ended October 31, 2018, we determined that due to the weight of objectively verifiable negative evidence, our U.K. deferred tax assets are no longer more likely than not to be realized in the future and a full valuation allowance was recorded. We have maintained the valuation allowance for the period ended January 31, 2019. On December 22, 2017, the Tax Cuts and Jobs Act of 2017 or the Tax Act was enacted. The Tax Act contains several key tax provisions that affect us, including, but not limited to, reducing the U.S. federal corporate tax rate from 34% to 21% imposing a one-time mandatory transition tax on previously untaxed foreign earnings, and changing rules related to the use of net operating loss carryforwards created in tax years beginning after December 31, 2017. In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Jobs Act (“SAB 118”), which allows us to record provisional amounts during a measurement period not to extend beyond one year past the enactment date.

Net Loss Per Share Attributable

Net Loss Per Share Attributable to Common Stockholders	6 Months Ended
	Jan. 31, 2019
Earnings Per Share [Abstract]
Net Loss Per Share Attributable to Common Stockholders	Net Loss Per Share Attributable to Common Stockholders The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders: Three Months Ended Six months ended 2019 2018 2019 2018 (in thousands) Net loss $ (3,555) $ (6,515) $ (11,143) $ (17,913) Accretion of Series C and D redeemable convertible preferred stock — (2,579) — (5,109) Net loss attributable to common stockholders $ (3,555) $ (9,094) $ (11,143) $ (23,022) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 122,741 31,434 121,664 31,125 Net loss per share attributable to common stockholders, basic and diluted $ (0.03) $ (0.29) $ (0.09) $ (0.74) Since we have reported net losses for all periods presented, we have excluded all potentially dilutive securities from the calculation of the diluted net loss per share attributable to common stockholders as their effect is antidilutive and accordingly, basic and diluted net loss per share attributable to common stockholders is the same for all periods presented. The following table summarizes the unweighted outstanding potentially dilutive securities that were excluded from the computation of the diluted net loss per share attributable to common stockholders because the impact of including them would have been antidilutive: January 31, 2019 2018 (in thousands) Convertible preferred stock — 72,501 Outstanding stock options 12,028 14,949 Shares subject to repurchase from early exercised stock options 239 1,171 Purchase rights committed under the ESPP 1,410 — Unvested RSUs 3,037 — Unvested PSUs (*) 464 — Total 17,178 88,621 (*) The number of unvested PSUs is based on the target number of shares granted and excludes unvested PSUs for which performance conditions have not been established as of January 31, 2019, as they are not considered outstanding for accounting purposes. Refer to Note 9 for further information.

Significant Customers and Geogr

Significant Customers and Geographic Information	6 Months Ended
	Jan. 31, 2019
Risks and Uncertainties [Abstract]
Significant Customers and Geographic Information	Significant Customers and Geographic Information No single customer accounted for 10% or more of our revenue for the three and six months ended January 31, 2019 and 2018. Refer to Note 1 to our condensed consolidated financial statements for revenue by geography information. The following table summarizes 10% or more of the total balance of accounts receivable, net: January 31, 2019 July 31, 2018 Channel partner A 13% * Channel partner B * 13% Channel partner C * 13% (*) Represents less than 10%. Our long-lived assets consist of property, equipment and intangible assets, which are summarized by geographic area as follows: January 31, 2019 July 31, 2018 (in thousands) United States $ 20,336 $ 14,742 Rest of the world 7,559 5,023 Total long-lived assets $ 27,895 $ 19,765

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jan. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions We previously entered into notes receivable agreements with certain of our current and former executives and employees in connection with the exercise of their stock options. Outstanding notes receivable were fully repaid during the six months ended January 31, 2019. Refer to Note 9 to our condensed consolidated financial statements for further information.

Business and Summary of Signi_2

Business and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States ("U.S. GAAP") and applicable regulations of the Securities and Exchange Commission ("SEC") regarding interim financial reporting, and include the accounts of the Company and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Certain information and note disclosures normally included in the financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the applicable required disclosures and regulations of the SEC. Therefore, these unaudited condensed consolidated financial statements and accompanying footnotes should be read in conjunction with the Company's audited consolidated financial statements and related notes in its Annual Report on Form 10-K for the fiscal year ended July 31, 2018 (the "Fiscal 2018 Form 10-K"), as filed with the SEC on September 13, 2018.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates, judgments and assumptions that affect the amounts reported and disclosed in the financial statements and accompanying notes. Such estimates include, but are not limited to, the determination of revenue recognition, deferred revenue, deferred contract acquisition costs, valuation of acquired intangible assets, the period of benefit generated from our deferred contract acquisition costs, allowance for doubtful accounts, valuation of common stock options and stock-based awards, useful lives of property and equipment, useful lives of acquired intangible assets, loss contingencies related to litigation and valuation of deferred tax assets. Management determines these estimates and assumptions based on historical experience and on various other assumptions that are believed to be reasonable. Actual results could differ significantly from these estimates, and such differences may be material to the condensed consolidated financial statements.
Revenue Recognition	Revenue Recognition We adopted Accounting Standards Codification ("ASC") Topic 606, Revenue From Contracts With Customers ("ASC 606") on August 1, 2017, using the full retrospective transition method. Disaggregation of Revenue Subscription and support revenue is recognized over time and accounted for approximately 97% and 99% of our revenue for the three months ended January 31, 2019 and 2018, respectively, and approximately 98% of our revenue for the six months ended January 31, 2019 and 2018. The following table summarizes the revenue by region based on the shipping address of customers who have contracted to use our cloud platform: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 Amount % Revenue Amount % Revenue Amount % Revenue Amount % Revenue (in thousands, except per percentage data) United States $ 37,626 51 % $ 20,224 45 % $ 67,433 49 % $ 39,985 47 % Europe, Middle East and Africa (*) 29,552 40 % 20,168 45 % 56,946 41 % 37,154 44 % Asia Pacific 5,674 7 % 3,465 8 % 10,463 8 % 6,554 8 % Other 1,450 2 % 1,119 2 % 2,758 2 % 1,144 1 % Total $ 74,302 100 % $ 44,976 100 % $ 137,600 100 % $ 84,837 100 % (*) Revenue from the United Kingdom ("U.K.") represented 10% and 12% of our revenue for the three months ended January 31, 2019 and 2018, respectively, and 10% and 11% for the six months ended January 31, 2019 and 2018, respectively. The following table summarizes the revenue from contracts by type of customer: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 Amount % Revenue Amount % Revenue Amount % Revenue Amount % Revenue (in thousands, except per percentage data) Channel partners $ 71,074 96 % $ 41,258 92 % $ 131,093 95 % $ 77,429 91 % Direct customers 3,228 4 % 3,718 8 % 6,507 5 % 7,408 9 % Total $ 74,302 100 % $ 44,976 100 % $ 137,600 100 % $ 84,837 100 % Contract Balances Contract liabilities consist of deferred revenue and include payments received in advance of performance under the contract. Such amounts are recognized as revenue over the contractual period. For the six months ended January 31, 2019 and 2018, we recognized revenue of $68.2 million and $58.6 million, respectively, that was included in the corresponding contract liability balance at the beginning of these periods. Remaining Performance Obligations The typical subscription and support term is one to three years. Most of our subscription and support contracts are non-cancelable over the contractual term. However, customers typically have the right to terminate their contracts for cause, if we fail to perform. As of January 31, 2019, the aggregate amount of the transaction price allocated to remaining performance obligations was $461.0 million. We expect to recognize 55% of the transaction price over the next 12 months and 98% of the transaction price over the next three years, with the remainder recognized thereafter. Costs to Obtain and Fulfill a Contract We capitalize sales commissions and associated payroll taxes paid to internal sales personnel that are incremental to the acquisition of channel partner and direct customer contracts. These costs are recorded as deferred contract acquisition costs in the condensed consolidated balance sheets.
Deferred Offering Costs	Deferred Offering CostsDeferred offering costs consisted of fees and expenses incurred in connection with our IPO, including legal, accounting, printing and other IPO-related costs.
Recently Adopted Accounting Pronouncements; Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Adopted Accounting Pronouncements In January 2017, the Financial Accounting Standard Board ("FASB") issued Accounting Standard Update ("ASU") No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The amendment was issued to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions of assets or businesses. This standard provides a screen test to determine when a set (inputs and processes that produce an output) is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. We adopted this standard as of August 1, 2018, and it did not have a material impact to our consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting , which provides clarity in applying the guidance in Topic 718 around modifications of share-based payment awards. We adopted this standard as of August 1, 2018, and it did not have a material impact to our consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . The new standard eliminates the diversity in practice related to the classification of certain cash receipts and payments for debt prepayment or extinguishment costs, the maturing of a zero-coupon bond, the settlement of contingent liabilities arising from a business combination, proceeds from insurance settlements, distributions from certain equity method investees and beneficial interests obtained in a financial asset securitization. We adopted this standard as of August 1, 2018 using the retrospective transition method, and it did not have a material impact to our consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash , which requires that amounts generally described as restricted cash or restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. We adopted this standard as of August 1, 2018 using the retrospective transition method and we have adjusted our prior period condensed consolidated statement of cash flows to conform to the current presentation. In June 2018, the FASB issued ASU No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting , which simplifies the accounting for equity awards granted to nonemployees. For public business entities, it is effective for fiscal years beginning after December 15, 2018, and interim periods therein. Early adoption is permitted. We early adopted this standard as of August 1, 2018 using the prospective transition method, which resulted in a cumulative-effect adjustment of $0.3 million recognized within stockholders' equity, as a reduction of additional paid-in capital against accumulated deficit, on the adoption date. In August 2018, the FASB issued ASU No. 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract ,” which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. The new standard requires capitalized costs to be amortized on a straight-line basis generally over the term of the arrangement, and the financial statement presentation for these capitalized costs would be the same as that of the fees related to the hosting arrangements. For public business entities, this standard is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. We early adopted this standard as of August 1, 2018 using the prospective transition method, and it did not have a material impact to our consolidated financial statements. In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, " Disclosure Update and Simplification ," amending certain disclosure requirements that have become redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders' equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders' equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. The final rule is effective November 5, 2018. We early adopted this requirement as of August 1, 2018, presenting the activity of the stockholder's equity accounts in the accompanying condensed statements of redeemable convertible preferred stock and stockholders' equity (deficit) for the periods presented. Recently Issued Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"), which requires lessees to recognize most leases on their balance sheets that do not meet the definition of a short-term lease but recognize the expenses on their statements of operations in a manner similar to current accounting rules. In July 2018, the FASB issued ASU 2018-10, Leases (Topic 842), Codification Improvements ("ASU 2018-10"), which clarifies certain adoption provisions of the new leases standard such as the application of implicit rate, lessee reassessment of lease classification and certain transition adjustments. In addition, in July 2018, the FASB issued ASU 2018-11, Leases (Topic 842), Targeted Improvements ("ASU 2018-11"), which allows for the adoption of ASU 2016-02 to be applied at the beginning of the year of adoption, as opposed to at the beginning of the earliest year presented in the financial statements. These standards are effective for fiscal years beginning after December 15, 2018, with early adoption permitted. We are currently evaluating the effect of these standards; however, we anticipate the most significant effects will relate to the recognition of right-of-use assets and lease liabilities arising from our real estate and data center operating leases that do not meet the definition of a short-term lease on the adoption date and providing qualitative and quantitative disclosures in the notes to the condensed consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . This ASU amends guidance on reporting credit losses for assets held at amortized cost basis and available-for-sale debt securities to require that credit losses on available-for-sale debt securities be presented as an allowance rather than as a write-down. The measurement of credit losses for newly recognized financial assets and subsequent changes in the allowance for credit losses are recorded in the statements of operations. For public business entities, it is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. We are currently evaluating the potential impact of this standard on our consolidated financial statements.

Business and Summary of Signi_3

Business and Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jan. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Disaggregation of Revenue	The following table summarizes the revenue by region based on the shipping address of customers who have contracted to use our cloud platform: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 Amount % Revenue Amount % Revenue Amount % Revenue Amount % Revenue (in thousands, except per percentage data) United States $ 37,626 51 % $ 20,224 45 % $ 67,433 49 % $ 39,985 47 % Europe, Middle East and Africa (*) 29,552 40 % 20,168 45 % 56,946 41 % 37,154 44 % Asia Pacific 5,674 7 % 3,465 8 % 10,463 8 % 6,554 8 % Other 1,450 2 % 1,119 2 % 2,758 2 % 1,144 1 % Total $ 74,302 100 % $ 44,976 100 % $ 137,600 100 % $ 84,837 100 % (*) Revenue from the United Kingdom ("U.K.") represented 10% and 12% of our revenue for the three months ended January 31, 2019 and 2018, respectively, and 10% and 11% for the six months ended January 31, 2019 and 2018, respectively. The following table summarizes the revenue from contracts by type of customer: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 Amount % Revenue Amount % Revenue Amount % Revenue Amount % Revenue (in thousands, except per percentage data) Channel partners $ 71,074 96 % $ 41,258 92 % $ 131,093 95 % $ 77,429 91 % Direct customers 3,228 4 % 3,718 8 % 6,507 5 % 7,408 9 % Total $ 74,302 100 % $ 44,976 100 % $ 137,600 100 % $ 84,837 100 %
Capitalized Contract Cost	The following table summarizes the activity of the deferred contract acquisition costs: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 (in thousands) Beginning balance $ 55,978 $ 36,002 $ 55,910 $ 34,662 Capitalization of contract acquisition costs 9,080 7,005 13,472 11,213 Amortization of deferred contract acquisition costs (4,457) (3,064) (8,781) (5,932) Ending balance $ 60,601 $ 39,943 $ 60,601 $ 39,943 As of the end of the period: Deferred contract acquisition costs, current $ 18,058 $ 12,271 $ 18,058 $ 12,271 Deferred contract acquisition costs, noncurrent 42,543 27,672 42,543 27,672 Total deferred contract acquisition costs $ 60,601 $ 39,943 $ 60,601 $ 39,943

Cash Equivalents and Short-Te_2

Cash Equivalents and Short-Term Investments (Tables)	6 Months Ended
	Jan. 31, 2019
Cash and Cash Equivalents [Abstract]
Schedule of Cash Equivalents and Short-Term Investments	Cash equivalents and short-term investments consisted of the following as of January 31, 2019: Amortized Unrealized Unrealized (in thousands) Cash equivalents: Money market funds $ 49,405 $ — $ — $ 49,405 U.S. treasury securities 4,993 — (1) 4,992 Total cash equivalents $ 54,398 $ — $ (1) $ 54,397 Short-term investments: U.S. treasury securities $ 130,212 $ 13 $ (15) $ 130,210 U.S. government agency securities 44,399 3 (44) 44,358 Corporate debt securities 97,923 50 (65) 97,908 Total short-term investments $ 272,534 $ 66 $ (124) $ 272,476 Total cash equivalents and short-term investments $ 326,932 $ 66 $ (125) $ 326,873 Cash equivalents and short-term investments consisted of the following as of July 31, 2018: Amortized Unrealized Unrealized (in thousands) Cash equivalents: Money market funds $ 74,408 $ — $ — $ 74,408 U.S. treasury securities 17,488 — — 17,488 U.S. government agency securities 1,999 — — 1,999 Corporate debt securities 11,010 — (1) 11,009 Total cash equivalents $ 104,905 $ — $ (1) $ 104,904 Short-term investments: U.S. treasury securities $ 55,768 $ — $ (17) $ 55,751 U.S. government agency securities 17,953 — (19) 17,934 Corporate debt securities 89,362 1 (88) 89,275 Total short-term investments $ 163,083 $ 1 $ (124) $ 162,960 Total cash equivalents and short-term investments $ 267,988 $ 1 $ (125) $ 267,864
Schedule of Maturities	The amortized cost and fair value of our short-term investments based on their stated maturities consisted of the following as of January 31, 2019: Amortized Fair Value (in thousands) Due within one year $ 213,194 $ 213,163 Due between one and two years 59,340 59,313 Total short-term investments $ 272,534 $ 272,476
Schedule of Unrealized Loss on Investments	Short-term investments that were in an unrealized loss position consisted of the following as of January 31, 2019: Less than 12 Months Greater than 12 Months Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) U.S. treasury securities $ 83,321 $ (15) $ — $ — $ 83,321 $ (15) U.S. government agency securities 35,588 (44) — — 35,588 (44) Corporate debt securities 72,855 (65) — — 72,855 (65) Total investments in a loss position $ 191,764 $ (124) $ — $ — $ 191,764 $ (124) Short-term investments that were in an unrealized loss position consisted of the following as of July 31, 2018: Less than 12 Months Greater than 12 Months Total Fair Unrealized Fair Unrealized Fair Unrealized (in thousands) U.S. treasury securities $ 55,750 $ (17) $ — $ — $ 55,750 $ (17) U.S. government agency securities 17,934 (19) — — 17,934 (19) Corporate debt securities 83,332 (88) — — 83,332 (88) Total investments in a loss position $ 157,016 $ (124) $ — $ — $ 157,016 $ (124)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jan. 31, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets Measured on Recurring Basis	Assets that are measured at fair value on a recurring basis consisted of the following as of January 31, 2019: Level I Level II Level III Total Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Cash equivalents: Money market funds $ 49,405 $ 49,405 $ — $ — U.S. treasury securities 4,992 — 4,992 — Total cash equivalents $ 54,397 $ 49,405 $ 4,992 $ — Short-term investments: U.S. treasury securities $ 130,210 $ — $ 130,210 $ — U.S. government agency securities 44,358 — 44,358 — Corporate debt securities 97,908 — 97,908 — Total short-term investments $ 272,476 $ — $ 272,476 $ — Assets that are measured at fair value on a recurring basis consisted of the following as of July 31, 2018: Level I Level II Level III Total Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Cash equivalents: Money market funds $ 74,408 $ 74,408 $ — $ — U.S. treasury securities 17,488 — 17,488 — U.S. government agency securities 1,999 — 1,999 — Corporate debt securities 11,009 — 11,009 — Total cash equivalents $ 104,904 $ 74,408 $ 30,496 $ — Short-term investments: U.S. treasury securities $ 55,751 $ — $ 55,751 $ — U.S. government agency securities 17,934 — 17,934 — Corporate debt securities 89,275 — 89,275 — Total short-term investments $ 162,960 $ — $ 162,960 $ —

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jan. 31, 2019
Property, Plant and Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment consisted of the following: January 31, 2019 July 31, 2018 (in thousands) Hosting equipment $ 39,960 $ 30,743 Computers and equipment 2,573 2,335 Purchased software 1,314 1,324 Capitalized internal-use software 7,066 6,163 Furniture and fixtures 1,514 1,478 Leasehold improvements 2,123 2,123 Property and equipment, gross 54,550 44,166 Less: Accumulated depreciation and amortization (28,788) (24,401) Total property and equipment, net $ 25,762 $ 19,765

Acquired Intangible Assets, N_2

Acquired Intangible Assets, Net (Tables)	6 Months Ended
	Jan. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Acquired Intangible Assets	The gross carrying amount and accumulated amortization of acquired intangible assets consisted of the following as of January 31, 2019: Gross Carrying Amount Accumulated Amortization Net Book Value (in thousands) Developed technology $ 1,716 $ (239) $ 1,477
Schedule of Future Amortization Expense	Future amortization expense of acquired intangible assets consisted of the following as of January 31, 2019: Amortization Year ending July 31, (in thousands) 2019 (remaining six months) $ 286 2020 572 2021 572 2022 47 Total $ 1,477

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jan. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Future minimum payments under our non-cancelable operating leases consisted of the following as of January 31, 2019: Operating (in thousands) Year ending July 31, 2019 (remaining six months) $ 1,578 2020 2,588 2021 1,604 2022 18 Total $ 5,788
Schedule of Future Minimum Payments for Other Commitments	Future minimum payments under our non-cancelable data center contracts consisted of the following as of January 31, 2019: Data Center Contracts (in thousands) Year ending July 31, 2019 (remaining six months) $ 4,416 2020 6,710 2021 4,131 2022 933 Total $ 16,190 Bandwidth and colocation expenses are recognized as cost of revenue and were $3.4 million and $2.2 million for the three months ended January 31, 2019 and 2018, respectively, and $6.4 million and $4.3 million for the six months ended January 31, 2019 and 2018, respectively.

Common Stock (Tables)

Common Stock (Tables)	6 Months Ended
	Jan. 31, 2019
Equity [Abstract]
Schedule of Common Stock Reserved for Future Issuance	Shares of common stock reserved for future issuance consisted of the following as of January 31, 2019: Underlying Shares (in thousands) Equity awards outstanding: Stock options 12,028 Unvested restricted stock units 3,037 Unvested performance stock units, based on the target number of shares granted (*) 1,460 Purchase rights committed under the employee stock purchase plan 1,410 Equity awards available for future grants: Equity incentive plans 15,815 Employee stock purchase plan 1,361 Total reserved shares of common stock for future issuance 35,111 (*) Holders of performance stock units corresponding to fiscal 2019, as further described in Note 9, have the ability to receive up to 150% of the target number of shares granted if the maximum achievement of target performance metrics is attained.

Stock Based Compensation (Table

Stock Based Compensation (Tables)	6 Months Ended
	Jan. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Stock Options	The activity of stock options consisted of the following: Outstanding Weighted-Average Weighted-Average Aggregate (in thousands, except per share amounts) Balance as of July 31, 2018 16,175 $ 6.20 5.1 $ 470,860 Stock options exercised (3,511) $ 4.41 $ 129,596 Stock options canceled, forfeited or expired (636) $ 6.22 Balance as of January 31, 2019 12,028 $ 6.72 4.9 $ 500,853 Exercisable and expected to vest as of July 31, 2018 5,499 $ 3.97 4.0 $ 172,317 Exercisable and expected to vest as of January 31, 2019 4,055 $ 4.52 4.0 $ 177,830
Schedule of Restricted Stock Units Activity	The activity of RSUs consisted of the following: RSUs Outstanding Weighted-Average Grant Date Fair Value per Share Aggregate (in thousands, except per share amounts) Balance as of July 31, 2018 209 $ 26.26 $ 7,394 Granted 2,888 $ 40.20 Vested (3) $ 44.26 $ 111 Canceled, forfeited (57) $ 40.36 Balance as of January 31, 2019 3,037 $ 39.23 $ 146,897
Schedule of Unvested Performance Stock Units	The number of unvested PSUs outstanding based on the target number of shares granted consisted of the following as of January 31, 2019: Underlying Shares Performance periods (in thousands) Fiscal 2019 464 Fiscal 2020 464 Fiscal 2021 150 Fiscal 2022 150 Total 1,228
Schedule of Performance Stock Units Activity	The activity of PSUs for which performance conditions have been established and are expected to be earned consisted of the following: Underlying Shares Weighted-Average Grant Date Fair Value per Share Aggregate (in thousands, except for share amounts) Balance as of July 31, 2018 — — $ — Granted 464 $ 36.90 Vested — — $ — Canceled, forfeited — — Balance as of January 31, 2019 464 $ 36.90 $ 22,456
Schedule of ESPP Valuation Assumptions	The fair value of the purchase right for the ESPP is estimated on the date of grant using the Black-Scholes model with the following assumptions: Six Months Ended January 31, 2019 Expected term (in years) 0.5 - 2.0 Expected stock price volatility 44.0% - 61.9% Risk-free interest rate 2.5% - 2.7% Dividend yield 0.0%
Schedule of Allocation of Stock-based Compensation Expense	The components of stock-based compensation expense recognized in the condensed consolidated statements of operations consisted of the following: Three Months Ended January 31, Six Months Ended January 31, 2019 2018 2019 2018 (in thousands) Cost of revenue $ 619 $ 126 1,122 $ 235 Sales and marketing 5,517 985 8,318 1,770 Research and development 4,398 494 7,193 892 General and administrative 2,693 459 4,180 900 Total stock-based compensation expense $ 13,227 $ 2,064 $ 20,813 $ 3,797
Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Valuation Assumptions	We estimated the fair value of employee stock option using the Black-Scholes option pricing model with the following assumptions. Six Months Ended January 31, 2018 Expected term (in years) 4.6 Expected stock price volatility 40.4% - 41.5% Risk-free interest rate 1.7% - 2.6% Dividend yield 0.0%

Net Loss Per Share Attributab_2

Net Loss Per Share Attributable to Common Stockholders (Tables)	6 Months Ended
	Jan. 31, 2019
Earnings Per Share [Abstract]
Schedule of Net Loss Per Share, Basic and Diluted	The following table sets forth the computation of basic and diluted net loss per share attributable to common stockholders: Three Months Ended Six months ended 2019 2018 2019 2018 (in thousands) Net loss $ (3,555) $ (6,515) $ (11,143) $ (17,913) Accretion of Series C and D redeemable convertible preferred stock — (2,579) — (5,109) Net loss attributable to common stockholders $ (3,555) $ (9,094) $ (11,143) $ (23,022) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted 122,741 31,434 121,664 31,125 Net loss per share attributable to common stockholders, basic and diluted $ (0.03) $ (0.29) $ (0.09) $ (0.74)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following table summarizes the unweighted outstanding potentially dilutive securities that were excluded from the computation of the diluted net loss per share attributable to common stockholders because the impact of including them would have been antidilutive: January 31, 2019 2018 (in thousands) Convertible preferred stock — 72,501 Outstanding stock options 12,028 14,949 Shares subject to repurchase from early exercised stock options 239 1,171 Purchase rights committed under the ESPP 1,410 — Unvested RSUs 3,037 — Unvested PSUs (*) 464 — Total 17,178 88,621 (*) The number of unvested PSUs is based on the target number of shares granted and excludes unvested PSUs for which performance conditions have not been established as of January 31, 2019, as they are not considered outstanding for accounting purposes. Refer to Note 9 for further information.

Significant Customers and Geo_2

Significant Customers and Geographic Information (Tables)	6 Months Ended
	Jan. 31, 2019
Risks and Uncertainties [Abstract]
Schedule of Accounts Receivable	The following table summarizes 10% or more of the total balance of accounts receivable, net: January 31, 2019 July 31, 2018 Channel partner A 13% * Channel partner B * 13% Channel partner C * 13% (*) Represents less than 10%.
Schedule of Long-Lived Assets	Our long-lived assets consist of property, equipment and intangible assets, which are summarized by geographic area as follows: January 31, 2019 July 31, 2018 (in thousands) United States $ 20,336 $ 14,742 Rest of the world 7,559 5,023 Total long-lived assets $ 27,895 $ 19,765

Business and Summary of Signi_4

Business and Summary of Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands	Mar. 31, 2018USD ($)$ / shares	Mar. 31, 2018USD ($)$ / sharesshares	Jan. 31, 2019USD ($)	Jan. 31, 2018	Jan. 31, 2019USD ($)	Jan. 31, 2018USD ($)	Aug. 01, 2018USD ($)	Jul. 31, 2018USD ($)	Jul. 31, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reverse stock split, ratio		0.6667
Sale of stock, number of shares issued in transaction (in shares) | shares		13,800,000
Sale of stock, price per share (in dollars per share) | $ / shares	$ 16	$ 16
Net proceeds from shares sold		$ 205,300
Payments of costs related to initial public offering		$ 15,500			$ 1,797	$ 2,896
Offering costs	$ 6,200
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) | shares		72,500,750
Conversion ratio		1
Contract with customer, liability, revenue recognized					68,200	$ 58,600
Revenue, remaining performance obligation			$ 461,000		461,000
Accrued sales commissions			$ 4,600		$ 4,600			$ 10,000
Cumulative effect of new accounting principle							$ 0		$ 0
Sales Revenue, Net | Geographic Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage			100.00%	100.00%	100.00%	100.00%
Subscription and Support | Transferred over Time | Sales Revenue, Net | Product Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage			97.00%	99.00%	98.00%	98.00%
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle							300		(438)
Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle							$ (300)		$ 438
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with customer, term of contract					1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract with customer, term of contract					3 years
ASU 2018-07 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle								300
ASU 2018-07 | Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle								$ (300)
United Kingdom | Sales Revenue, Net | Geographic Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk percentage			10.00%	12.00%	10.00%	11.00%

Business and Summary of Signi_5

Business and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 74,302	$ 44,976	$ 137,600	$ 84,837
Channel partners
Disaggregation of Revenue [Line Items]
Revenue	71,074	41,258	131,093	77,429
Direct customers
Disaggregation of Revenue [Line Items]
Revenue	$ 3,228	$ 3,718	$ 6,507	$ 7,408
Geographic Concentration Risk | Sales Revenue, Net
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk | Sales Revenue, Net
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk | Sales Revenue, Net | Channel partners
Disaggregation of Revenue [Line Items]
Concentration risk percentage	96.00%	92.00%	95.00%	91.00%
Customer Concentration Risk | Sales Revenue, Net | Direct customers
Disaggregation of Revenue [Line Items]
Concentration risk percentage	4.00%	8.00%	5.00%	9.00%
United States
Disaggregation of Revenue [Line Items]
Revenue	$ 37,626	$ 20,224	$ 67,433	$ 39,985
United States | Geographic Concentration Risk | Sales Revenue, Net
Disaggregation of Revenue [Line Items]
Concentration risk percentage	51.00%	45.00%	49.00%	47.00%
Europe, Middle East and Africa
Disaggregation of Revenue [Line Items]
Revenue	$ 29,552	$ 20,168	$ 56,946	$ 37,154
Europe, Middle East and Africa | Geographic Concentration Risk | Sales Revenue, Net
Disaggregation of Revenue [Line Items]
Concentration risk percentage	40.00%	45.00%	41.00%	44.00%
Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue	$ 5,674	$ 3,465	$ 10,463	$ 6,554
Asia Pacific | Geographic Concentration Risk | Sales Revenue, Net
Disaggregation of Revenue [Line Items]
Concentration risk percentage	7.00%	8.00%	8.00%	8.00%
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 1,450	$ 1,119	$ 2,758	$ 1,144
Other | Geographic Concentration Risk | Sales Revenue, Net
Disaggregation of Revenue [Line Items]
Concentration risk percentage	2.00%	2.00%	2.00%	1.00%

Business and Summary of Signi_6

Business and Summary of Significant Accounting Policies - Summary of Deferred Contract Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jul. 31, 2018	Jan. 31, 2018
Changes in Capitalized Contract Cost [Roll Forward]
Beginning balance	$ 55,978	$ 36,002	$ 55,910	$ 34,662
Capitalization of contract acquisition costs	9,080	7,005	13,472	11,213
Amortization of deferred contract acquisition costs	(4,457)	(3,064)	(8,781)	(5,932)
Ending balance	60,601	39,943	60,601	39,943
Deferred contract acquisition costs, current					$ 18,058	$ 16,136	$ 12,271
Deferred contract acquisition costs, noncurrent					42,543	39,774	27,672
Total deferred contract acquisition costs	$ 55,978	$ 36,002	$ 55,910	$ 34,662	$ 60,601	$ 55,910	$ 39,943

Business and Summary of Signi_7

Business and Summary of Significant Accounting Policies - Remaining Performance Obligation (Details)	3 Months Ended
	Jan. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	55.00%
Recognized transaction price period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, percentage	98.00%
Recognized transaction price period	3 years

Cash Equivalents and Short-Te_3

Cash Equivalents and Short-Term Investments - Schedule of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jul. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	$ 54,398	$ 104,905
Cash equivalents, unrealized gains	0	0
Cash equivalents, unrealized losses	(1)	(1)
Cash equivalents	54,397	104,904
Short-term investments, amortized cost basis	272,534	163,083
Short-term investment, unrealized gains	66	1
Short-term investments, unrealized losses	(124)	(124)
Short-term investments	272,476	162,960
Cash equivalents and short-term investments, amortized cost	326,932	267,988
Cash equivalents and short-term investments, unrealized gains	66	1
Cash equivalents and short-term investments, unrealized losses	(125)	(125)
Cash equivalents and short-term investments, estimated fair value	326,873	267,864
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	49,405	74,408
Cash equivalents, unrealized gains	0	0
Cash equivalents, unrealized losses	0	0
Cash equivalents	49,405	74,408
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	4,993	17,488
Cash equivalents, unrealized gains	0	0
Cash equivalents, unrealized losses	(1)	0
Cash equivalents	4,992	17,488
Short-term investments, amortized cost basis	130,212	55,768
Short-term investment, unrealized gains	13	0
Short-term investments, unrealized losses	(15)	(17)
Short-term investments	130,210	55,751
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost		1,999
Cash equivalents, unrealized gains		0
Cash equivalents, unrealized losses		0
Cash equivalents		1,999
Short-term investments, amortized cost basis	44,399	17,953
Short-term investment, unrealized gains	3	0
Short-term investments, unrealized losses	(44)	(19)
Short-term investments	44,358	17,934
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost		11,010
Cash equivalents, unrealized gains		0
Cash equivalents, unrealized losses		(1)
Cash equivalents		11,009
Short-term investments, amortized cost basis	97,923	89,362
Short-term investment, unrealized gains	50	1
Short-term investments, unrealized losses	(65)	(88)
Short-term investments	$ 97,908	$ 89,275

Cash Equivalents and Short-Te_4

Cash Equivalents and Short-Term Investments - Schedule of Maturities (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jul. 31, 2018
Amortized Cost
Due within one year, cost basis	$ 213,194
Due between one and two years, cost basis	59,340
Short-term investments, amortized cost basis	272,534	$ 163,083
Fair Value
Due within one year, fair value	213,163
Due between one and two years, fair value	59,313
Total short-term investments, fair value	$ 272,476	$ 162,960

Cash Equivalents and Short-Te_5

Cash Equivalents and Short-Term Investments - Schedule of Unrealized Position (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jul. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	$ 191,764	$ 157,016
Less than 12 months, unrealized losses	(124)	(124)
Greater than 12 months, fair value	0	0
Greater than 12 months, unrealized losses	0	0
Total fair value	191,764	157,016
Total unrealized losses	(124)	(124)
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	83,321	55,750
Less than 12 months, unrealized losses	(15)	(17)
Greater than 12 months, fair value	0	0
Greater than 12 months, unrealized losses	0	0
Total fair value	83,321	55,750
Total unrealized losses	(15)	(17)
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	35,588	17,934
Less than 12 months, unrealized losses	(44)	(19)
Greater than 12 months, fair value	0	0
Greater than 12 months, unrealized losses	0	0
Total fair value	35,588	17,934
Total unrealized losses	(44)	(19)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, fair value	72,855	83,332
Less than 12 months, unrealized losses	(65)	(88)
Greater than 12 months, fair value	0	0
Greater than 12 months, unrealized losses	0	0
Total fair value	72,855	83,332
Total unrealized losses	$ (65)	$ (88)

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jul. 31, 2018
Cash equivalents:
Cash equivalents	$ 54,397	$ 104,904
Short-term investments	272,476	162,960
Fair Value, Measurements, Recurring
Cash equivalents:
Cash equivalents	54,397	104,904
Short-term investments	272,476	162,960
Fair Value, Measurements, Recurring | Level I
Cash equivalents:
Cash equivalents	49,405	74,408
Short-term investments	0	0
Fair Value, Measurements, Recurring | Level II
Cash equivalents:
Cash equivalents	4,992	30,496
Short-term investments	272,476	162,960
Fair Value, Measurements, Recurring | Level III
Cash equivalents:
Cash equivalents	0	0
Short-term investments	0	0
Money market funds
Cash equivalents:
Cash equivalents	49,405	74,408
Money market funds | Fair Value, Measurements, Recurring
Cash equivalents:
Cash equivalents	49,405	74,408
Money market funds | Fair Value, Measurements, Recurring | Level I
Cash equivalents:
Cash equivalents	49,405	74,408
Money market funds | Fair Value, Measurements, Recurring | Level II
Cash equivalents:
Cash equivalents	0	0
Money market funds | Fair Value, Measurements, Recurring | Level III
Cash equivalents:
Cash equivalents	0	0
U.S. treasury securities
Cash equivalents:
Cash equivalents	4,992	17,488
Short-term investments	130,210	55,751
U.S. treasury securities | Fair Value, Measurements, Recurring
Cash equivalents:
Cash equivalents	4,992	17,488
Short-term investments	130,210	55,751
U.S. treasury securities | Fair Value, Measurements, Recurring | Level I
Cash equivalents:
Cash equivalents	0	0
Short-term investments	0	0
U.S. treasury securities | Fair Value, Measurements, Recurring | Level II
Cash equivalents:
Cash equivalents	4,992	17,488
Short-term investments	130,210	55,751
U.S. treasury securities | Fair Value, Measurements, Recurring | Level III
Cash equivalents:
Cash equivalents	0	0
Short-term investments	0	0
U.S. government agency securities
Cash equivalents:
Cash equivalents		1,999
Short-term investments	44,358	17,934
U.S. government agency securities | Fair Value, Measurements, Recurring
Cash equivalents:
Cash equivalents		1,999
Short-term investments	44,358	17,934
U.S. government agency securities | Fair Value, Measurements, Recurring | Level I
Cash equivalents:
Cash equivalents		0
Short-term investments	0	0
U.S. government agency securities | Fair Value, Measurements, Recurring | Level II
Cash equivalents:
Cash equivalents		1,999
Short-term investments	44,358	17,934
U.S. government agency securities | Fair Value, Measurements, Recurring | Level III
Cash equivalents:
Cash equivalents		0
Short-term investments	0	0
Corporate debt securities
Cash equivalents:
Cash equivalents		11,009
Short-term investments	97,908	89,275
Corporate debt securities | Fair Value, Measurements, Recurring
Cash equivalents:
Cash equivalents		11,009
Short-term investments	97,908	89,275
Corporate debt securities | Fair Value, Measurements, Recurring | Level I
Cash equivalents:
Cash equivalents		0
Short-term investments	0	0
Corporate debt securities | Fair Value, Measurements, Recurring | Level II
Cash equivalents:
Cash equivalents		11,009
Short-term investments	97,908	89,275
Corporate debt securities | Fair Value, Measurements, Recurring | Level III
Cash equivalents:
Cash equivalents		0
Short-term investments	$ 0	$ 0

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jul. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 54,550	$ 44,166
Less: Accumulated depreciation and amortization	(28,788)	(24,401)
Total property and equipment, net	25,762	19,765
Hosting equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,960	30,743
Computers and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,573	2,335
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,314	1,324
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	7,066	6,163
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,514	1,478
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,123	$ 2,123

Property and Equipment - Narrat

Property and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 2,500	$ 2,000	$ 4,662	$ 3,910

Acquired Intangible Assets, N_3

Acquired Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jan. 31, 2019	Jan. 31, 2019	Jan. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets		$ 239	$ 0
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average useful lives		2 years 7 months 6 days
Amortization of acquired intangible assets	$ 100	$ 200

Acquired Intangible Assets, N_4

Acquired Intangible Assets, Net - Schedule of Acquired Intangible Assets (Details) $ in Thousands	Jan. 31, 2019USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,477
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,716
Accumulated Amortization	(239)
Net Book Value	$ 1,477

Acquired Intangible Assets, N_5

Acquired Intangible Assets, Net - Schedule of Future Amortization Expense (Details) $ in Thousands	Jan. 31, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2019 (remaining six months)	$ 286
2,020	572
2,021	572
2,022	47
Total	$ 1,477

Commitments and Contingencies -

Commitments and Contingencies - Summary of Future Minimum Payments Under Operating Leases (Details) $ in Thousands	Jan. 31, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019 (remaining six months)	$ 1,578
2,020	2,588
2,021	1,604
2,022	18
Total	$ 5,788

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2018	Jul. 31, 2017
Loss Contingencies [Line Items]
Rent expense	$ 0.8	$ 0.6	$ 1.4	$ 1.1
Bandwidth and colocation costs	3.4	$ 2.2	6.4	$ 4.3
Purchase obligation	3.7		3.7		$ 3.1
Finjan Litigation
Loss Contingencies [Line Items]
Accrued liability for potential lawsuit loss	$ 3.2		$ 3.2
Loss recognized					$ 0.7	$ 2.5

Commitments and Contingencies_3

Commitments and Contingencies - Future Minimum Payments Due Under Data Center Contracts (Details) $ in Thousands	Jan. 31, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
2019 (remaining six months)	$ 4,416
2,020	6,710
2,021	4,131
2,022	933
Total	$ 16,190

Preferred Stock (Details)

Preferred Stock (Details) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 31, 2018USD ($)shares	Jan. 31, 2018USD ($)	Jan. 31, 2018USD ($)	Jan. 31, 2019USD ($)	Oct. 31, 2018USD ($)	Jul. 31, 2018USD ($)	Oct. 31, 2017USD ($)	Jul. 31, 2017USD ($)
Temporary Equity Disclosure [Abstract]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) | shares	72,500,750
Conversion ratio	1
Temporary equity, carrying value	$ 207,300	$ 206,086	$ 206,086	$ 0	$ 0	$ 0	$ 203,507	$ 200,977
Temporary equity, accretion value	$ 24,700
Accretion of Series C and D redeemable convertible preferred stock		$ 2,579	$ 5,109

Common Stock (Details)

Common Stock (Details)	Jan. 31, 2019vote
Equity [Abstract]
Common stock, number of votes per share	1

Common Stock - Schedule of Comm

Common Stock - Schedule of Common Stock Reserved for Future Issuance (Details) - shares	6 Months Ended
	Jan. 31, 2019	Jul. 31, 2018
Subsidiary, Sale of Stock [Line Items]
Equity awards outstanding (in shares)	12,028,000	16,175,000
Equity awards available for future grants (in shares)	35,111,000
Outstanding stock options
Subsidiary, Sale of Stock [Line Items]
Equity awards outstanding (in shares)	12,028,000
Unvested RSUs
Subsidiary, Sale of Stock [Line Items]
Equity awards outstanding (in shares)	3,037,000
Unvested performance stock units, based on the target number of shares originally granted
Subsidiary, Sale of Stock [Line Items]
Equity awards outstanding (in shares)	1,460,000
Percentage of shares originally granted	150.00%
Equity incentive plans
Subsidiary, Sale of Stock [Line Items]
Equity awards available for future grants (in shares)	15,815,000
Employee stock purchase plan
Subsidiary, Sale of Stock [Line Items]
Equity awards outstanding (in shares)	1,410,000
Equity awards available for future grants (in shares)	1,361,000

Stock Based Compensation - Narr

Stock Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019USD ($)$ / sharesshares	Jan. 31, 2018USD ($)	Jan. 31, 2019USD ($)vote$ / sharesshares	Jan. 31, 2018USD ($)	Jul. 31, 2018USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares) | shares	18,688,000		18,688,000
Shares available for grant (in shares) | shares	15,815,000		15,815,000
Options exercised, aggregate intrinsic value			$ 129,596	$ 5,200
Weighted average grant date fair value (in dollars per share) | $ / shares			$ 3.12
Vesting of early exercised stock options	$ 277	$ 467	$ 567	1,015
Interest receivable					$ 100
Outstanding notes receivable, carrying amount					2,100
Repayment of loans			2,100
Unrecognized compensation cost	$ 148,500		$ 148,500
Unrecognized compensation cost, weighted-average			3 years 6 months
Unvested RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Unvested performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares originally granted			150.00%
Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Outstanding stock options | 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration term			10 years
Outstanding stock options | 2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration term			7 years
Employee Stock | 2018 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares) | shares	3,397,643		3,397,643
Employee subscription rate, maximum			15.00%
Maximum number of shares per employee (in shares) | shares			3,000
Purchase price of common stock, percent			85.00%
Duration of offering period			24 months
Number of purchases periods | vote			4
Duration of purchase periods			6 months
Shares issued (in shares) | shares			627,000
Weighted-average purchase price per share (in dollars per share) | $ / shares	$ 13.86		$ 13.86
Cash proceeds from the issuance of common stock			$ 8,700
Accrued compensation	$ 2,200		$ 2,200		$ 4,600
Fiscal 2019 | Unvested RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage			25.00%
Fiscal 2019 | Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights, percentage			25.00%
Common Stock | 2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock subject to repurchase (in shares) | shares	238,662		238,662		422,528
Shares subject to repurchase, value	$ 1,000		$ 1,000		$ 1,600
Additional Paid-In Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting of early exercised stock options	$ 277	$ 467	$ 567	$ 1,015

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended		12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jul. 31, 2018
Outstanding Stock Options
Balance (in shares)	16,175,000
Stock options exercised (in shares)	(3,511,000)
Stock options canceled, forfeited, expired (in shares)	(636,000)
Balance (in shares)	12,028,000		16,175,000
Exercisable and expected to vest as of July 31, 2018 (in shares)	5,499,000
Exercisable and expected to vest as of January 31, 2019 (in shares)	4,055,000		5,499,000
Weighted-Average Exercise Price
Beginning balance (in dollars per share)	$ 6.20
Stock options exercised (in dollars per share)	4.41
Stock options canceled, forfeited, expired (in dollars per share)	6.22
Ending balance (in dollars per share)	6.72		$ 6.20
Exercisable and expected to vest as of July 31, 2018 (in dollars per share)	3.97
Exercisable and expected to vest as of January 31, 2019 (in dollars per share)	$ 4.52		$ 3.97
Additional Disclosures
Options outstanding, weighted average remaining contractual term	4 years 10 months 24 days		5 years 1 month 6 days
Exercisable and expected to vest, weighted average remaining contractual term	4 years		4 years
Options outstanding, aggregate intrinsic value	$ 500,853		$ 470,860
Options exercised, aggregate intrinsic value	129,596	$ 5,200
Exercisable and expected to vest, aggregate intrinsic value	$ 177,830		$ 172,317

Stock Based Compensation - Valu

Stock Based Compensation - Valuation Assumptions (Details)	6 Months Ended
	Jan. 31, 2019
Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	4 years 7 months 6 days
Dividend yield	0.00%
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 months
Expected stock price volatility	44.00%
Risk-free interest rate	2.50%
Minimum | Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected stock price volatility	40.40%
Risk-free interest rate	1.70%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	2 years
Expected stock price volatility	69.10%
Risk-free interest rate	2.70%
Maximum | Outstanding stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected stock price volatility	41.50%
Risk-free interest rate	2.60%

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of RSU Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jan. 31, 2019	Jul. 31, 2018
Aggregate Intrinsic Value
Balance	$ 22,456
Vested	$ 0
Unvested RSUs
Number of Shares
Beginning balance (in shares)	209
Granted (in shares)	2,888
Vested (in shares)	(3)
Canceled, forfeited (in shares)	(57)
Ending balance (in shares)	3,037
Weighted-Average Grant Date Fair Value per Share
Balance (in dollars per share)	$ 39.23	$ 26.26
Granted (in dollars per share)	40.20
Vested (in dollars per share)	44.26
Canceled, forfeited (in shares)	$ 40.36
Aggregate Intrinsic Value
Balance	$ 146,897	$ 7,394
Vested	$ 111

Stock Based Compensation - Sc_3

Stock Based Compensation - Schedule of Unvested PSUs (Details)	Jan. 31, 2019shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target Shares (in shares)	1,228,000
Fiscal 2,019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target Shares (in shares)	464,000
Fiscal 2,020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target Shares (in shares)	464,000
Fiscal 2,021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target Shares (in shares)	150,000
Fiscal 2,022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target Shares (in shares)	150,000

Stock Based Compensation - Sc_4

Stock Based Compensation - Schedule of PSU Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jan. 31, 2019	Jul. 31, 2018
Aggregate Intrinsic Value
Balance	$ 22,456
Vested	$ 0
Unvested performance stock units
Number of Shares
Beginning balance (in shares)	0
Granted (in shares)	464
Vested (in shares)	0
Canceled, forfeited (in shares)	0
Ending balance (in shares)	464
Weighted-Average Grant Date Fair Value per Share
Balance (in dollars per share)	$ 36.90	$ 0
Granted (in dollars per share)	36.90
Vested (in dollars per share)	0
Canceled, forfeited (in shares)	$ 0
Aggregate Intrinsic Value
Balance		$ 0

Stock Based Compensation - Stoc

Stock Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 13,227	$ 2,064	$ 20,813	$ 3,797
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	619	126	1,122	235
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	5,517	985	8,318	1,770
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	4,398	494	7,193	892
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense	$ 2,693	$ 459	$ 4,180	$ 900

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 547	$ 357	$ 874	$ 646

Net Loss Per Share (Details)

Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Earnings Per Share [Abstract]
Net loss	$ (3,555)	$ (6,515)	$ (11,143)	$ (17,913)
Accretion of Series C and D redeemable convertible preferred stock	0	(2,579)	0	(5,109)
Net loss attributable to common stockholders	$ (3,555)	$ (9,094)	$ (11,143)	$ (23,022)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	122,741	31,434	121,664	31,125
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.03)	$ (0.29)	$ (0.09)	$ (0.74)

Net Loss Per Share Attributab_3

Net Loss Per Share Attributable to Common Stockholders - Antidilutive Securities Excluded from Computation (Details) - shares shares in Thousands	6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	17,178	88,621
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0	72,501
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	12,028	14,949
Shares subject to repurchase from early exercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	239	1,171
Purchase rights committed under the ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	1,410	0
Unvested RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	3,037	0
Unvested performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	464	0

Significant Customers and Geo_3

Significant Customers and Geographic Information - Schedule of Accounts Receivable (Details) - Customer Concentration Risk - Accounts Receivable	6 Months Ended		12 Months Ended
	Jan. 31, 2019		Jul. 31, 2018
Channel partner A
Concentration Risk [Line Items]
Accounts receivable, net	13.00%
Channel partner B
Concentration Risk [Line Items]
Accounts receivable, net		[1]	13.00%
Channel partner C
Concentration Risk [Line Items]
Accounts receivable, net		[1]	13.00%
[1]	less than 10%

Significant Customers and Geo_4

Significant Customers and Geographic Information - Schedule of Long-lived Assets (Details) - USD ($) $ in Thousands	Jan. 31, 2019	Jul. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 27,895	$ 19,765
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	20,336	14,742
Rest of the world
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 7,559	$ 5,023

Uncategorized Items - zs-201901

Label	Element	Value
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	$ 180,000
Restricted Cash and Cash Equivalents, Current	us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue	96,000
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	388,000
Restricted Cash and Cash Equivalents, Noncurrent	us-gaap_RestrictedCashAndCashEquivalentsNoncurrent	$ 292,000