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Stock-based Payments - Stock Purchase Warrants Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] |  |  |
Exercised | $ 10,045 | $ 905 |
Forfeited | $ 8,587 | $ 388 |
Warrant |  |  |
Number of Shares |  |  |
Beginning Balance (in shares) | 1,671,440 | 2,004,284 |
Granted (in shares) | 0 | 0 |
Exercised (in shares) | (858,695) | (247,468) |
Forfeited (in shares) | (760,601) | (85,376) |
Expired (in shares) | (52,144) | 0 |
Ending Balance (in shares) | 0 | 1,671,440 | 2,004,284
Weighted Average Exercise Price |  |  |
Beginning Balance (in usd per share) | $ 6.20 | $ 5.57 |
Granted (in usd per share) | 0.00 | 0.00 |
Exercised (in usd per share) | 5.62 | 5.28 |
Forfeited (in usd per share) | 5.76 | 4.80 |
Expired (in usd per share) | 4.85 | 0.00 |
Ending Balance (in usd per share) | $ 0.00 | $ 6.20 | $ 5.57
Weighted Average Remaining Contractual Life (Years), Balance | 0 years | 11 months | 1 year 9 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] |  |  |
Beginning Balance | $ 5,730 | $ 0 |
Granted | 0 | 0 |
Expired | 700 | 0 |
Ending Balance | $ 0 | $ 5,730 | $ 0

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were expired during the reporting period. + References No definition available. + Details
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- Definition Weighted average price at which option holders acquired shares when converting their options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to options of the plan that expired. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to options that were terminated. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were exercised during the reporting period. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value, Exercised + References No definition available. + Details
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- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Aggregate Intrinsic Value, Expired + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards granted. Excludes stock and unit options. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options. + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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