Property and Equipment (Summary of Property and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,815	$ 1,441
Less: accumulated depreciation	(923)	(639)
Total property and equipment, net	892	802
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	333	258
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	166	595
Computers and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	836	108
Field trailers
Property, Plant and Equipment [Line Items]
Property and equipment, gross	10	10
Design center
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 470	$ 470