Stock incentive plans (Tables)

12 Months Ended

Dec. 31, 2013

Stock incentive plans

Schedule of recognized stock-based compensation expense

	Years ended December 31,
	2013		2012		2011
Network operations	$	888	$	352	$	463
Development and technology		380		352		577
Selling and marketing		1,045		571		650
General and administrative		2,193		1,460		1,733
Total stock-based compensation expense	$	4,506	$	2,735	$	3,423

Schedule 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, 2010		5,288		$	1.25		6.3	$	38,279
Granted		2,381		$	13.02
Exercised		(1,015	)	$	1.01
Canceled/forfeited		(53	)	$	6.58
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
Vested, exercisable and expected to vest at December 31, 2013		4,788		$	6.25		6.5	$	9,520
Exercisable at December 31, 2013		2,739		$	4.52		4.8	$	9,329

Summary of the RSU activity

	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