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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 28, 2017 | Oct. 29, 2016 | Oct. 28, 2017 | Oct. 29, 2016 | Jan. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 201,000 | $ 623,000 | $ 579,000 | $ 1,595,000 |
Prior period tax benefits recognized upon completion of R&D study | 334,000 |  | 334,000 |  |
Cumulative unrecognized tax benefits | $ 663,000 |  | 663,000 |  | $ 708,000
Developments affecting unrecognized tax benefits |  |  | $ 0 |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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