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Stock incentive plans (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of stock-based compensation expense


	Year Ended December 31,
	2018		2017		2016
Network operations	$	2,070	$	2,174	$	2,144
Development and technology		1,242		1,068		1,070
Selling and marketing		1,868		2,060		1,842
General and administrative		7,088		8,913		7,749
Total stock-based compensation expense	$	12,268	$	14,215	$	12,805

Summary of stock option activity


		Weighted		Weighted-Average
	Number of	Average		Remaining	Aggregate
	Options	Exercise		Contract	Intrinsic
	(000’s)	Price		Life (years)	Value
Outstanding at December 31, 2017	1,283	$	9.58	3.8	$	16,573
Exercised	(972)	$	10.26
Canceled/forfeited	(7)	$	5.99
Outstanding and exercisable at December 31, 2018	304	$	7.49	3.8	$	3,970

Summary of RSU activity


		Weighted
	Number of	Average
	Shares	Grant Date
	(000’s)	Fair Value
Non-vested at December 31, 2017	3,324	$	7.35
Granted(2)	978	$	13.73
Vested	(1,113)	$	8.99
Canceled/forfeited	(70)	$	14.98
Non-vested at December 31, 2018	3,119	$	8.60

(2)

The RSUs granted to all of our named executive officers in 2016 were subject to satisfaction of specified service-based and performance-based conditions. The performance objectives were subject to under- or over- achievement on a sliding scale, with a threshold of 50% of the target number of RSUs and a maximum of 150% of the target RSUs. In February 2018, our Compensation Committee determined actual achievement of the 2016 performance-based RSUs resulting in additional RSUs granted of approximately 584,000 at a grant-date fair value of $6.13 per share during the year ended December 31, 2018.