Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2015

The major classes of property and equipment are as follows:

	Useful Life	2015		2014
Production machinery and equipment	5 years	$	1,427,472	$	1,446,551
Other machinery and equipment, primarily computers and research equipment	3 – 5 years		421,318		602,974
Furniture and fixtures	7 years		648,131		670,567
Software	3 years		476,530		476,530
Leasehold improvements*	Term of Lease		897,584		927,406
		$	3,871,035	$	4,124,028

We amortize leasehold improvements over the term of the lease, which in all cases is shorter than the estimated useful life of the asset.