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Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Notes Receivable From Stockholders | Accumulated Other Comprehensive Income (Loss) | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Common stock, beginning balance (in shares) at Jul. 31, 2018 |  | 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 |  |  |  |
Issuance of common stock upon exercise of stock options | 15,493 | $ 4 | 15,489 |  |  |
Issuance of common stock under the employee stock purchase plan (in shares) |  | 627,000 |  |  |  |
Issuance of common stock in connection with employee stock purchase plan | 8,691 | $ 1 | 8,690 |  |  |
Vesting of restricted stock units (in shares) |  | 3,000 |  |  |  |
Vesting of restricted stock units | 0 |  |  |  |  |
Vesting of early exercised common stock options | 567 |  | 567 |  |  |
Stock-based compensation | 20,813 |  | 20,813 |  |  |
Unrealized net gains on available-for-sale securities | 65 |  |  |  | 65 |
Net loss | (11,143) |  |  |  |  | (11,143)
Adjustment to initial public offering costs | 300 |  | 300 |  |  |
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 |  | 123,897,000 |  |  |  |
Ending balance at Jan. 31, 2019 | 277,073 | $ 124 | 483,951 | 0 | (59) | (206,943)
Common stock, beginning balance (in shares) at Oct. 31, 2018 |  | 122,106,000 |  |  |  |
Beginning balance at Oct. 31, 2018 | 252,178 | $ 122 | 455,761 |  | (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 under the employee stock purchase plan (in shares) |  | 627,000 |  |  |  |
Issuance of common stock in connection with employee stock purchase plan | 8,691 | $ 1 | 8,690 |  |  |
Vesting of restricted stock units (in shares) |  | 3,000 |  |  |  |
Vesting of restricted stock units | 0 |  |  |  |  |
Vesting of early exercised common stock options | 277 |  | 277 |  |  |
Stock-based compensation | 13,227 |  | 13,227 |  |  |
Unrealized net gains on available-for-sale securities | 258 |  |  |  | 258 |
Net loss | (3,555) |  |  |  |  | (3,555)
Adjustment to initial public offering costs | 300 |  | 300 |  |  |
Common stock, ending balance (in shares) at Jan. 31, 2019 |  | 123,897,000 |  |  |  |
Ending balance at Jan. 31, 2019 | $ 277,073 | $ 124 | 483,951 | 0 | (59) | (206,943)
Common stock, beginning balance (in shares) at Jul. 31, 2019 | 127,253 | 127,253,000 |  |  |  |
Beginning balance at Jul. 31, 2019 | $ 308,558 | $ 127 | 532,618 | 0 | 268 | (224,455)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock upon exercise of stock options (in shares) | 1,220,000 | 1,220,000 |  |  |  |
Issuance of common stock upon exercise of stock options | $ 6,758 | $ 2 | 6,756 |  |  |
Issuance of common stock under the employee stock purchase plan (in shares) |  | 284,000 |  |  |  |
Issuance of common stock in connection with employee stock purchase plan | 5,334 |  | 5,334 |  |  |
Vesting of restricted stock units (in shares) |  | 509,000 |  |  |  |
Vesting of restricted stock units | 0 |  |  |  |  |
Vesting of early exercised common stock options | 262 |  | 262 |  |  |
Stock-based compensation | 44,259 |  | 44,259 |  |  |
Unrealized net gains on available-for-sale securities | 223 |  |  |  | 223 |
Net loss | $ (46,230) |  |  |  |  | (46,230)
Common stock, ending balance (in shares) at Jan. 31, 2020 | 129,266 | 129,266,000 |  |  |  |
Ending balance at Jan. 31, 2020 | $ 319,164 | $ 129 | 589,229 | 0 | 491 | (270,685)
Common stock, beginning balance (in shares) at Oct. 31, 2019 |  | 127,926,000 |  |  |  |
Beginning balance at Oct. 31, 2019 | 314,052 | $ 128 | 555,019 |  | 436 | (241,531)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock upon exercise of stock options (in shares) |  | 675,000 |  |  |  |
Issuance of common stock upon exercise of stock options | 3,699 | $ 1 | 3,698 |  |  |
Issuance of common stock under the employee stock purchase plan (in shares) |  | 284,000 |  |  |  |
Issuance of common stock in connection with employee stock purchase plan | 5,334 |  | 5,334 |  |  |
Vesting of restricted stock units (in shares) |  | 381,000 |  |  |  |
Vesting of restricted stock units | 0 |  |  |  |  |
Vesting of early exercised common stock options | 131 |  | 131 |  |  |
Stock-based compensation | 25,047 |  | 25,047 |  |  |
Unrealized net gains on available-for-sale securities | 55 |  |  |  | 55 |
Net loss | $ (29,154) |  |  |  |  | (29,154)
Common stock, ending balance (in shares) at Jan. 31, 2020 | 129,266 | 129,266,000 |  |  |  |
Ending balance at Jan. 31, 2020 | $ 319,164 | $ 129 | $ 589,229 | $ 0 | $ 491 | $ (270,685)

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