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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