Property and equipment

12 Months Ended

Dec. 31, 2015

Property and equipment

Property and equipment

3. Property and equipment

Property and equipment, net consist of the following:

	Estimated
	useful life			As of December 31,
	(in years)			2015		2014
Equipment	2	-	7	$	958,175	$	945,116
Computer hardware	3	-	5		3,266,233		2,963,629
Furniture and fixtures	5	-	7		192,565		194,399
Leasehold improvements	3	-	10		746,336		749,275
Total property and equipment, gross					5,163,309		4,852,419
Less: Accumulated depreciation and amortization					(3,351,690)		(2,712,672)
Property and equipment, net				$	1,811,619	$	2,139,747

Property and equipment depreciation and amortization expense is as follows:

	Year ended December 31,
	2015			2014		2013
Depreciation and amortization expense		$	664,303	$	621,695	$	554,765