Information Regarding Net Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net revenue	$ 24,859	$ 23,026	$ 62,084	$ 64,785
Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	100.00%	100.00%	100.00%	100.00%
Americas
Segment Reporting Information [Line Items]
Net revenue	$ 15,050	$ 17,825	$ 42,588	$ 48,495
Americas | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	61.00%	77.00%	69.00%	75.00%
Europe and the Middle East
Segment Reporting Information [Line Items]
Net revenue	$ 2,082	$ 2,436	$ 7,312	$ 8,790
Europe and the Middle East | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	8.00%	11.00%	12.00%	14.00%
Asia-Pacific
Segment Reporting Information [Line Items]
Net revenue	$ 7,727	$ 2,765	$ 12,184	$ 7,500
Asia-Pacific | Geographic Concentration Risk | Revenue from Contract with Customer
Segment Reporting Information [Line Items]
Percentage of net revenue	31.00%	12.00%	19.00%	11.00%