Revenue Recognition - Disaggregated Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	$ 15,366	$ 14,641	$ 14,180	$ 15,096	$ 16,839	$ 16,694	$ 19,203	$ 20,678	$ 59,283	$ 73,414
Partner Solutions Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									50,628	61,159
Edge to Cloud Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									8,655	12,255
Partner Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									50,628	61,159
Partner Solutions [Member] | Partner Solutions Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									50,628	61,159
Edge to Cloud [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									8,655	12,255
Edge to Cloud [Member] | Edge to Cloud Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									8,655	12,255
North America [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									50,110	69,088
North America [Member] | Partner Solutions Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									42,443	58,523
North America [Member] | Edge to Cloud Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									7,667	10,565
Europe [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									2,023	3,055
Europe [Member] | Partner Solutions Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									1,273	2,239
Europe [Member] | Edge to Cloud Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									750	816
Asia [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									7,150	1,271
Asia [Member] | Partner Solutions Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									6,912	397
Asia [Member] | Edge to Cloud Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregated revenue									$ 238	$ 874