Property and equipment (Tables)

3 Months Ended

Mar. 31, 2013

	Estimated useful life (years)	As of March 31, 2013			As of December 31, 2012
Equipment	2 - 5	$	927,012		$	923,356
Computer hardware	3 - 5	1,863,187			1,688,262
Furniture and fixtures	5 - 7	163,891			72,155
Leasehold improvements	5 - 7	616,566			263,691
		3,570,656			2,947,464
Less: Accumulated depreciation and amortization		(1,668,718		)	(1,551,310		)
Property and equipment, net		$	1,901,938		$	1,396,154

Schedule of property and equipment depreciation and amortization expense

	Three months ended March 31,
	2013		2012
Depreciation and amortization expense	$	118,761	$	139,753

- 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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