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
Oct. 31, 2018
Feb. 01, 2018
Jan. 31, 2018
Assets      
Unbilled receivables $ 7,881   $ 3,101
Prepaid expenses and other current assets 5,479   3,557
Stockholders' equity:      
Accumulated loss (164,679)   (148,620)
ASU 2014-09 [Member]      
Assets      
Unbilled receivables 7,881 $ 3,238  
Prepaid expenses and other current assets 5,479 4,381  
Liabilities      
Deferred revenues 7,074 13,075  
Stockholders' equity:      
Accumulated loss (164,679) (146,301)  
Under ASC 605 [Member] | ASU 2014-09 [Member]      
Assets      
Unbilled receivables 8,561   3,101
Prepaid expenses and other current assets 5,113   3,557
Liabilities      
Deferred revenues 13,418   14,433
Stockholders' equity:      
Accumulated loss 170,709   $ (148,620)
Adjustment [Member] | ASU 2014-09 [Member]      
Assets      
Unbilled receivables (680) 137  
Prepaid expenses and other current assets 366 824  
Liabilities      
Deferred revenues 6,344 (1,358)  
Stockholders' equity:      
Accumulated loss $ 6,030 $ 2,319