Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2014

The major classes of property and equipment are as follows:



	Useful Life	2014		2013
Production machinery and equipment	5 years	$	1,446,551	$	1,239,834
Other machinery and equipment, primarily computers and research equipment	3 – 5 years	602,974		658,860
Furniture and fixtures	7 years	670,567		439,715
Software	3 years	476,530		544,254
Leasehold improvements*	Term of Lease	927,406		726,396
		$	4,124,028	$	3,609,059

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