Business Segment and Geographic Area Information - Geographic Area Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 22,544	$ 20,639
Long-Lived Assets	6,502		$ 6,838
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	21,899	19,287
Long-Lived Assets	6,502		6,838
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	328	629
Long-Lived Assets	0		0
Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	86	304
Long-Lived Assets	0		0
Rest of the World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	231	$ 419
Long-Lived Assets	$ 0		$ 0