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Overview and Basis of Presentation - Additional Information (Details) - USD ($)	Feb. 01, 2019	Apr. 30, 2019
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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Stockholders equity note disclosure.

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Amount of the related income tax effect of a cumulative effect on retained earnings.

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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.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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-Publisher FASB
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Amount of lessee's right to use underlying asset under operating lease.

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