Segment Reporting and Geographic Information - Net Sales by Geographic Region based on Location of Sales Organization (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net sales by geographic region
Revenues	$ 8,406	$ 9,938	$ 18,152	$ 20,279
United States
Net sales by geographic region
Revenues	6,513	6,296	12,390	12,643
Canada
Net sales by geographic region
Revenues	1,243	2,835	4,421	5,957
Europe
Net sales by geographic region
Revenues	650	807	1,341	1,679
International
Net sales by geographic region
Revenues	$ 1,893	$ 3,642	$ 5,762	$ 7,636