Information about Operating Segments and Geographic Areas - Profit and Loss Information of Segments (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
Segment Reporting Information [Line Items]
Revenue	$ 15,366	$ 14,641	$ 14,180	$ 15,096	$ 16,839	$ 16,694	$ 19,203	$ 20,678	$ 59,283	$ 73,414
Cost of revenue									49,187	57,904
Gross profit	2,650	2,632	2,423	2,391	3,690	3,359	3,261	5,200	10,096	15,510
Operating expenses									19,410	29,441
Other income, net									149	207
Income tax expense									(16)	(13)
Net loss	$ (1,360)	$ (1,107)	$ (3,868)	$ (2,846)	$ (5,533)	$ (2,087)	$ (3,683)	$ (2,434)	(9,181)	(13,737)
Partner Solutions [Member]
Segment Reporting Information [Line Items]
Revenue									50,628	61,159
Cost of revenue									43,198	51,408
Gross profit									7,430	9,751
Edge to Cloud [Member]
Segment Reporting Information [Line Items]
Revenue									8,655	12,255
Cost of revenue									5,989	6,496
Gross profit									$ 2,666	$ 5,759