Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Operations
Revenue	$ 250,821	$ 204,369	$ 159,344
Costs and operating expenses:
Network access	113,572	90,702	69,112
Network operations	52,215	47,615	42,307
Development and technology	31,372	26,754	22,126
Selling and marketing	22,647	20,933	18,729
General and administrative	30,302	35,568	29,719
Amortization of intangible assets	3,710	3,498	3,448
Total costs and operating expenses	253,818	225,070	185,441
Loss from operations	(2,997)	(20,701)	(26,097)
Interest and other expense, net	(1,887)	(153)	(459)
Loss before income taxes	(4,884)	(20,854)	(26,556)
Income tax (benefit) expense	(5,153)	(2,078)	427
Net income (loss)	269	(18,776)	(26,983)
Net income attributable to non-controlling interests	1,489	590	348
Net loss attributable to common stockholders	$ (1,220)	$ (19,366)	$ (27,331)
Net loss per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.03)	$ (0.49)	$ (0.72)
Diluted (in dollars per share)	$ (0.03)	$ (0.49)	$ (0.72)
Weighted average shares used in computing net loss per share attributable to common stockholders:
Basic (in shares)	42,066	39,824	38,025
Diluted (in shares)	42,066	39,824	38,025