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Overview and Basis of Presentation - Additional Information (Details) - USD ($) | Feb. 01, 2019 | Apr. 30, 2019
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Stockholders Equity Note Disclosure [Line Items] |  |
Operating lease right-of-use assets |  | $ 3,740,000
Operating lease liabilities |  | $ 3,972,000
Accounting Standards Update 2016-02 |  |
Stockholders Equity Note Disclosure [Line Items] |  |
Operating lease right-of-use assets | $ 4,100,000 |
Operating lease liabilities | 4,300,000 |
Adjustment to accumulated deficit | 0 |
Deferred rent for leases | $ 200,000 |

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- Definition Amount of the related income tax effect of a cumulative effect on retained earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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