Property and equipment (Tables)

6 Months Ended

Jun. 30, 2016

Property and equipment

Schedule of property and equipment, net

	Estimated			As of		As of
	useful life			June 30,		December 31,
	(in years)			2016		2015
Equipment	2	-	7	$	1,006,334	$	958,175
Computer hardware	3	-	5		3,405,534		3,266,233
Furniture and fixtures	5	-	7		202,859		192,565
Leasehold improvements	3	-	10		778,104		746,336
Total property and equipment					5,392,831		5,163,309
Less: Accumulated depreciation and amortization					(3,789,949)		(3,351,690)
Property and equipment, net				$	1,602,882	$	1,811,619

Schedule of property and equipment depreciation and amortization expense

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
Depreciation and amortization expense	$	277,433	$	153,243	$	440,559	$	324,472