Property and equipment (Tables)

12 Months Ended

Dec. 31, 2012

	Estimated useful life	As of December 31,
	(years)	2012			2011

Equipment	5	$	923,356		$	1,102,132
Computer hardware	5	1,688,262			1,292,504
Furniture and fixtures	5 - 7	72,155			77,779
Leasehold improvements	5 - 7	263,691			321,596
		2,947,464			2,794,011
Less: Accumulated depreciation and amortization		(1,551,310		)	(1,570,449		)
Property and equipment, net		$	1,396,154		$	1,223,562

Schedule of property and equipment depreciation and amortization expense

	Year ended December 31,
	2012		2011		2010

Depreciation and amortization expense	$	532,784	$	656,837	$	502,250

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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