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Balance Sheet - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2019 USD ($) customer | Jan. 31, 2019 USD ($) customer
Balance Sheet [Line Items] |  |
Number of customers due | customer | 2 | 3
Contracts receivable | $ 2,100,000 | $ 3,000,000
Contracts receivable, noncurrent | $ 90,000 | $ 712,000
Contracts receivable, interest rate | 3.20% | 3.60%
Impairment of long-lived assets | $ 0 | $ 0
Minimum |  |
Balance Sheet [Line Items] |  |
Contracts receivable repayment term | 1 month |
Maximum |  |
Balance Sheet [Line Items] |  |
Contracts receivable repayment term | 30 months |

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- Definition Balance Sheet [Line Items] + References No definition available. + Details
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- Definition Contract Receivable Gross + References No definition available. + Details
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- Definition Contract receivable net, noncurrent. + References No definition available. + Details
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- Definition Contracts receivable repayment term. + References No definition available. + Details
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- Definition Number of customers. + References No definition available. + Details
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- Definition The weighted average interest rate charged on contract receivables maturing after one year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49354-109356 + Details
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- Details
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