Consolidated Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Revenue:    
Total revenue $ 8,485 $ 14,935
Cost of revenue:    
Total cost of revenue 5,577 6,029
Gross profit 2,908 8,906
Operating expenses:    
Research and development 4,252 5,729
Selling and marketing 2,852 3,667
General and administrative 4,249 4,572
Severance and restructuring costs 211 54
Total operating expenses 11,564 14,022
Loss from operations (8,656) (5,116)
Other expense, net (1,791) (849)
Loss from operations before income taxes (10,447) (5,965)
Income tax expense (benefit) 402 (494)
Net loss $ (10,849) $ (5,471)
Net loss per share, basic and diluted $ (0.30) $ (0.15)
Weighted average common shares outstanding, basic and diluted 36,461 35,608
Comprehensive loss:    
Net loss $ (10,849) $ (5,471)
Other comprehensive income (loss), net of tax:    
Foreign currency translation adjustment 1,207 575
Unrealized gains (losses) on marketable securities 35 (29)
Total other comprehensive income 1,242 546
Comprehensive loss (9,607) (4,925)
Product [Member]    
Revenue:    
Total revenue 1,179 3,091
Cost of revenue:    
Cost of revenue 909 326
Service [Member]    
Revenue:    
Total revenue 7,306 11,844
Cost of revenue:    
Cost of revenue $ 4,668 $ 5,703