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Revenue Recognition - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 02, 2019
Nov. 02, 2019
Jan. 31, 2019
Disaggregation of Revenue [Abstract]      
Contract liabilities and extended warranties $ 387,000 $ 387,000 $ 373,000
Revenue recognized   279,000  
Contract assets balance 825,000 825,000 $ 903,000
Amortization of incremental direct costs   82,000  
Deferred incremental direct contract costs reported in other current assets $ 117,000 $ 117,000  
Amortization period of contract costs 7 years 7 years  
Deferred incremental direct costs net of accumulated amortization $ 942,000 $ 942,000  
Capitalized Contract Costs Benefitial Term   10 years  
Capitalised contract costs additionally incurred $ 121,000