Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Schedule of Impact on Consolidated Balance Sheet of Adopting ASC 606 (Detail)

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Revenue from Contracts with Customers - Schedule of Impact on Consolidated Balance Sheet of Adopting ASC 606 (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Feb. 01, 2018
Jan. 31, 2018
Assets      
Prepaid expenses and other current assets $ 3,265 $ 4,381 $ 3,557
Liabilities      
Deferred revenues 11,282 12,938  
Stockholders' equity:      
Accumulated loss (151,772) (146,301) (148,620)
Under ASC 605 [Member] | ASU 2014-09 [Member]      
Assets      
Prepaid expenses and other current assets 2,899   3,557
Liabilities      
Deferred revenues 15,628   14,433
Stockholders' equity:      
Accumulated loss (156,484)   $ (148,620)
Adjustment [Member] | ASU 2014-09 [Member]      
Assets      
Prepaid expenses and other current assets 366 824  
Liabilities      
Deferred revenues (4,346) (1,495)  
Stockholders' equity:      
Accumulated loss $ 4,712 $ 2,319