Stock incentive plans (Tables)

9 Months Ended

Sep. 30, 2015

Stock incentive plans

Schedule of stock-based compensation expense

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Network operations	$	336	$	344	$	1,095	$	983
Development and technology	319		118		546		378
Selling and marketing	600		396		1,769		1,132
General and administrative	1,001		984		2,780		2,717
Total stock-based compensation	$	2,256	$	1,842	$	6,190	$	5,210

Summary of stock option activity

	Number of Options (000’s)		Weighted Average Exercise Price		Weighted- Average Remaining Contract Life (years)	Aggregate Intrinsic Value
Outstanding at December 31, 2014	4,341		$	6.60	5.8	$	11,017
Exercised	(375	)	$	3.32
Canceled/forfeited	(135	)	$	9.82
Outstanding at September 30, 2015	3,831		$	6.80	5.2	$	10,928
Vested, exercisable and expected to vest at September 30, 2015	3,801		$	6.80	5.2	$	10,879
Exercisable at September 30, 2015	3,101		$	6.51	4.7	$	9,965

Summary of nonvested RSU activity under the 2011 Plan

	Number of Shares (000’s)		Weighted Average Grant-Date Fair Value
Non-vested at December 31, 2014	1,385		$	6.09
Granted	1,423		$	7.57
Vested	(749	)	$	8.01
Canceled/forfeited	(52	)	$	7.03
Non-vested at September 30, 2015	2,007		$	6.40