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Provision for Income Taxes - Change in Uncertain Tax Positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |
Balance, beginning of the year | $ 151 | $ 121
Addition based on tax positions related to prior years | 0 | 0
Payment made on tax positions related to prior years | 0 | 0
Addition based on tax positions related to current year | 0 | 30
Balance, end of year | $ 151 | $ 151

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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