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Recent Accounting Pronouncements - Additional Information (Details) - USD ($) | Nov. 01, 2019 | Nov. 01, 2018 | Apr. 30, 2020
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Operating lease liability | $ 10,300,000 |  | $ 10,486,000
Operating lease ROU assets | 10,100,000 |  | $ 10,051,000
ASC 842 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment increase in Accumulated deficit | 0 |  |
Operating lease liability | 10,300,000 |  |
Operating lease ROU assets | $ 10,100,000 |  |
ASU 2014-09 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment increase in Accumulated deficit |  | $ 6,700,000 |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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