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Stock-Based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2022 | Apr. 30, 2022 | Jul. 31, 2021 | Apr. 30, 2021 | Jul. 31, 2022 | Mar. 15, 2022 | Jul. 31, 2021 | Jan. 31, 2022 | Feb. 01, 2022 | Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan |  | $ 2,354 |  | $ 3,817 | $ 2,354 |  |  | $ 6,485 |  |
Expected volatility rate |  |  |  |  |  |  | 59.24% |  |  |
Stock-based compensation expense | $ 16,082 |  | $ 20,402 |  | $ 34,168 |  | $ 35,000 |  |  |
Shares Committed under 2017 ESPP |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized, annual increase (in shares) |  |  |  |  |  |  |  |  | 1,311,569 | 2,500,000
Number of shares authorized, annual increase, percentage of outstanding shares at the end of prior fiscal year |  |  |  |  |  |  |  |  |  | 1.00%
Number of shares authorized (in shares) | 4,397,670 |  |  |  | 4,397,670 |  |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) | 341,970 |  |  |  |  | 457,595 |  |  |  |
Shares purchased under plan (in dollars per share) |  |  |  |  |  | $ 5.14 |  |  |  |
Issuance of common stock under employee stock purchase plan |  |  |  |  |  | $ 2,400 |  |  |  |
Employee withholdings for future purchases under the ESPP | $ 2,000 |  |  |  | $ 2,000 |  |  |  |  |
Expected life (in years) |  |  |  |  | 6 months |  |  |  |  |
Expected volatility rate |  |  |  |  | 48.87% |  |  |  |  |
Risk free interest rate |  |  |  |  | 0.86% |  | 0.06% |  |  |
Stock-based compensation expense | 300 |  | $ 500 |  | $ 700 |  | $ 1,100 |  |  |
Unrecognized compensation cost | $ 100 |  |  |  | $ 100 |  |  |  |  |
Unrecognized compensation cost, period for recognition (in years) |  |  |  |  | 1 month 17 days |  |  |  |  |
Maximum payroll deduction (as a percent of eligible compensation) |  |  |  |  | 15.00% |  |  |  |  |
Purchase price of common stock (as a percent) |  |  |  |  | 85.00% |  |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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