Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	$ 2,432	$ 2,536
Less accumulated depreciation	(1,631)	(1,260)
Property and Equipment, Net	801	1,276
Office furniture and equipment
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	$ 911	917
Office furniture and equipment | Minimum
Property Plant And Equipment [Line Items]
Property and Equipment, Useful Life	3 years
Office furniture and equipment | Maximum
Property Plant And Equipment [Line Items]
Property and Equipment, Useful Life	7 years
Rental inventory
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	$ 1,216	1,314
Property and Equipment, Useful Life	5 years
Vehicles
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	$ 76	76
Property and Equipment, Useful Life	5 years
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	$ 104	104
Leasehold improvements | Minimum
Property Plant And Equipment [Line Items]
Property and Equipment, Useful Life	2 years
Leasehold improvements | Maximum
Property Plant And Equipment [Line Items]
Property and Equipment, Useful Life	6 years
Assembly equipment
Property Plant And Equipment [Line Items]
Property and Equipment, Gross	$ 125	$ 125
Property and Equipment, Useful Life	7 years