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Balance Sheet Components - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Jan. 31, 2020
Balance Sheet Components [Line Items] |  |  |  |  |  |
Amortization expense |  | $ 300,000 | $ 300,000 | $ 652,000 | $ 516,000 |
Amortization expense for deferred sales commissions |  | 900,000 | $ 400,000 | 1,700,000 | $ 800,000 |
Impairment loss in relation to deferred commission costs capitalized |  |  |  | 0 |  |
Non-cancelable purchase commitments |  | 4,000,000.0 |  | 4,000,000.0 |  | $ 4,000,000.0
Global Telecomm Corporation |  |  |  |  |  |
Balance Sheet Components [Line Items] |  |  |  |  |  |
Inventory prepayments |  | 300,000 |  | 300,000 |  | 500,000
Non-cancelable purchase commitments |  | $ 400,000 |  | $ 400,000 |  | $ 2,200,000
Global Telecomm Corporation | Convertible Promissory Note |  |  |  |  |  |
Balance Sheet Components [Line Items] |  |  |  |  |  |
Investment in privately-held company | $ 1,300,000 |  |  |  |  |
Convertible promissory note, maturity period | 18 months |  |  |  |  |
Convertible promissory note, interest rate | 10.00% |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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