Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and contingencies

Schedule of operating lease expense

	Year ended December 31,
	2013		2012		2011
Operating lease expense	$	1,509,465	$	1,515,189	$	1,396,122

Schedule of future minimum rental payments under non-cancelable operating leases

Years ending December 31,
2014	$	1,475,095
2015		1,347,295
2016		1,266,001
2017		80,602
2018		5,489
Thereafter		—
Total minimum lease payments	$	4,174,482

Schedule of leased property under capital leases

	December 31,
	2013			2012
Computer hardware	$	1,607,602		$	882,246
Computer software		258,306			—
Total capital leases, gross		1,865,908			882,246
Less: Accumulated depreciation		(662,082	)		(257,615	)
Total capital leases, net	$	1,203,826		$	624,631

Schedule of future minimum rental payment under capital leases

Years ending December 31,
2014	$	509,083
2015		371,305
2016		123,179
2017		10,968
2018		3,620
Thereafter		—
Total minimum lease payments		1,018,155
Less: Amounts representing taxes, included in total minimum lease payments(*)		—
Net minimum lease payments		1,018,155
Less: Amounts representing interest payments		(68,559	)
Present value of net minimum lease payments	$	949,596

*

Tax amounts related to capital lease payments are inconsequential.

Schedule of future minimum payments under those agreements

Years ending December 31,
2014	$	356,667
2015		316,667
2016		366,667
2017		416,667
2018		300,000
Thereafter		—
Total payments	$	1,756,668