Revenue Recognition - Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	$ 16,729	$ 15,096
Partner Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	15,905	13,101
Edge to Cloud [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	824	1,995
North America [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	13,776	14,528
North America [Member] | Partner Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	13,171	12,727
North America [Member] | Edge to Cloud [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	605	1,801
Europe [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	639	461
Europe [Member] | Partner Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	426	320
Europe [Member] | Edge to Cloud [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	213	141
Asia [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	2,314	107
Asia [Member] | Partner Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	2,308	54
Asia [Member] | Edge to Cloud [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	$ 6	$ 53