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v3.21.1

Stock-based compensation (Details) - shares |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2020 | Apr. 01, 2019 | Jul. 09, 2018 | Mar. 31, 2021
2017 Plan |  |  |  |
Share based payments |  |  |  |
Shares authorized (in shares) |  |  |  | 2,659,885
Number of shares available for grant |  |  | 2,520,247 | 0
2018 Plan |  |  |  |
Share based payments |  |  |  |
Shares authorized (in shares) |  |  | 3,617,968 |
Number of shares available for grant |  |  |  | 1,282,506
Additional shares authorized (in shares) | 1,466,749 | 1,266,278 |  |
ESPP |  |  |  |
Share based payments |  |  |  |
Additional shares authorized (in shares) | 366,687 | 316,569 | 697,224 |
Common stock reserved for issuance | 1,031,868 |  | 348,612 |
Share based payment award percentage of outstanding shares |  |  | 1.00% |
Stock options |  |  |  |
Share based payments |  |  |  |
Exercise price for persons holding ten percent of voting power (as a percent) |  |  |  | 100.00%
Exercise price for persons holding more than ten percent of voting power (as a percent) |  |  |  | 110.00%
Share based payment award expiration period |  |  |  | 10 years
Share based payment award vesting period |  |  |  | 4 years
Stock options | Minimum |  |  |  |
Share based payments |  |  |  |
Expiration period for persons holding more than ten percent of voting power |  |  |  | 10 years
Stock options | Maximum |  |  |  |
Share based payments |  |  |  |
Expiration period for persons holding ten percent of voting power |  |  |  | 5 years
2018 Plan |  |  |  |
Share based payments |  |  |  |
Share based payment award percentage of outstanding shares |  |  | 4.00% |

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- Definition Minimum percentage of exercise price of the fair market value for all incentive options granted to any person possessing 10% or less of the total combined voting power of all classes of shares. + References No definition available. + Details
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- Definition Award expiration period for persons possessing more than ten percent of voting power, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Award expiration period for persons possessing ten percent of voting power, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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