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Revenue and Deferred Revenue - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2019 USD ($) Country Customer	Oct. 31, 2018 Country Customer	Oct. 31, 2019 USD ($) Source Country Customer	Oct. 31, 2018 Country Customer
Disaggregation Of Revenue [Line Items]
Number of sources of revenue | Source			2
Number of countries outside United States represented 10% or more of total revenue | Country	0	0	0	0
Number of customers that individually exceeded 10% of revenue | Customer	0	0	0	0
Deferred revenue recognized | $	$ 2.3		$ 14.1
Ooma Residential | Revenue
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	55.00%	67.00%	59.00%	69.00%
Ooma Business | Revenue
Disaggregation Of Revenue [Line Items]
Concentration risk, percentage	42.00%	30.00%	38.00%	27.00%

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