Business Segment Information - Schedule of Segment Reporting Information by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net revenue	$ 16,453	$ 19,559	$ 46,458	$ 56,885
United States [Member]
Net revenue	12,495	15,349	36,196	44,658
Canada [Member]
Net revenue	1,234	1,365	4,148	4,372
Mexico [Member]
Net revenue	206	425	1,293	1,164
China [Member]
Net revenue	1,581	1,646	2,867	4,543
Latin America [Member]
Net revenue	256	461	659	1,263
Europe [Member]
Net revenue	456	250	809	427
Asia (Excluding China) [Member]
Net revenue	160		337	216
Other [Member]
Net revenue	$ 65	$ 63	$ 149	$ 252