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.

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Acquired Intangible Assets and Goodwill - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	May 31, 2019	Oct. 31, 2019	Oct. 31, 2019	Oct. 31, 2018	Jan. 31, 2019
Finite Lived Intangible Assets [Line Items]
Goodwill		$ 4,264	$ 4,264		$ 3,898
Amortization expense			$ 900	$ 540
Product
Finite Lived Intangible Assets [Line Items]
Impairment charges		$ 700
Broadsmart Global, Inc.
Finite Lived Intangible Assets [Line Items]
Intangible assets recognized from acquisition	$ 6,100
Goodwill recognized from acquisition	$ 400