Stock incentive plans (Tables)

12 Months Ended

Dec. 31, 2014

Stock incentive plans

Schedule of stock-based compensation expense

	Years ended December 31,
	2014		2013		2012
Network operations	$	1,356	$	888	$	352
Development and technology		600		380		352
Selling and marketing		2,017		1,045		571
General and administrative		3,191		2,193		1,460
Total stock-based compensation expense	$	7,164	$	4,506	$	2,735

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, 2011		6,601		$	5.50		7.0	$	30,996
Granted		1,391		$	8.29
Exercised		(1,899	)	$	1.36
Canceled/forfeited		(1,048	)	$	11.85
Outstanding at December 31, 2012		5,045		$	6.50		6.4	$	14,742
Granted		1,351		$	6.73
Exercised		(461	)	$	1.33
Canceled/forfeited		(980	)	$	10.20
Outstanding at December 31, 2013		4,955		$	6.31		6.6	$	9,535
Granted		203		$	5.99
Exercised		(458	)	$	2.53
Canceled/forfeited		(359	)	$	7.53
Outstanding at December 31, 2014		4,341		$	6.60		5.8	$	11,017
Vested, exercisable and expected to vest at December 31, 2014		4,267		$	6.58		5.7	$	10,946
Exercisable at December 31, 2014		3,053		$	5.83		4.9	$	10,014

Summary of nonvested RSU activity under the 2014 Plan

	Number of Shares (000's)			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2012		—		$	—
Granted		799		$	6.21
Vested		(6	)	$	6.39
Canceled/forfeited		(40	)	$	6.05
Nonvested at December 31, 2013		753		$	6.22
Granted		1,650		$	6.02
Vested		(868	)	$	6.09
Canceled/forfeited		(150	)	$	6.02
Nonvested at December 31, 2014		1,385		$	6.09