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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019
Income Tax [Line Items] |  |  |  |
Income tax expense (benefit) |  | $ (16,000) |  | $ (38,000)
Unrecognized tax benefits | $ 6,800,000 |  | $ 6,800,000 |
Interest expense or penalties related to unrecognized tax benefits |  |  | 0 |
Voxter Communications Inc |  |  |  |
Income Tax [Line Items] |  |  |  |
Income tax expense (benefit) | $ 0 | $ (16,000) | $ 0 | $ (38,000)

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