Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Schedule of Impact of Consolidated Statements of Cash Flows of Adopting ASC 606 (Detail)

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Revenue from Contracts with Customers - Schedule of Impact of Consolidated Statements of Cash Flows of Adopting ASC 606 (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Cash used in operating activities:    
Net loss $ (18,378) $ (7,120)
Unbilled receivables (4,957) 3,289
Prepaid expenses and other current assets (2,107) 62
Deferred revenues (7,060) 355
Other operating activities 2,424 327
Total cash used in operating activities (23,625) $ (908)
ASU 2014-09 [Member]    
Cash used in operating activities:    
Net loss (18,378)  
Unbilled receivables (4,957)  
Prepaid expenses and other current assets (2,107)  
Deferred revenues (7,060)  
Other operating activities 2,488  
Total cash used in operating activities (23,626)  
Under ASC 605 [Member] | ASU 2014-09 [Member]    
Cash used in operating activities:    
Net loss (22,089)  
Unbilled receivables (5,638)  
Prepaid expenses and other current assets (1,740)  
Deferred revenues (716)  
Other operating activities 169  
Total cash used in operating activities (23,626)  
Adjustment [Member] | ASU 2014-09 [Member]    
Cash used in operating activities:    
Net loss 3,711  
Unbilled receivables 680  
Prepaid expenses and other current assets 366  
Deferred revenues (6,344)  
Other operating activities $ 2,319