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Equity Incentive Plans and Employee Stock Purchase Plan - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 | Jan. 31, 2018
Shares |  |
Balance - beginning of period (in shares) | 12,637,435 |
Stock options exercised (in shares) | (2,540,312) |
Stock options forfeited and expired (in shares) | (640,584) |
Balance - end of period (in shares) | 9,456,539 | 12,637,435
Vested and exercisable (in shares) | 5,377,483 | 5,540,858
Weighted- Average Exercise Price Per Share |  |
Balance - beginning of period (in dollars per share) | $ 7.63 |
Stock options exercised (in dollars per share) | 6.92 |
Stock options forfeited and expired (in dollars per share) | 8.43 |
Balance - end of period (in dollars per share) | 7.76 | $ 7.63
Vested and exercisable (in dollars per share) | $ 6.89 | $ 6.33
Weighted- Average Remaining Contractual Term (In Years) |  |
Balance | 7 years 15 days | 7 years 8 months 19 days
Vested and exercisable | 6 years 3 months 15 days | 6 years 7 months 17 days
Aggregate Intrinsic Value |  |
Balance | $ 697,319 | $ 246,227
Vested and exercisable | $ 401,189 | $ 115,122

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- Definition Share Based Compensation Arrangement by Share-based Payment Award, Aggregate Intrinsic Value [Roll Forward] + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share-based Payment Award, Weighted Average Remaining Contractual Term [Roll Forward] + References No definition available. + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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