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Nature of Expenses Allocated by Function
 12 Months Ended
Dec. 31, 2016
Other Income and Expenses [Abstract]  
Nature of Expenses Allocated by Function Disclosure
Nature of Expenses Allocated by Function
Nature of Expenses Allocated to Cost of Revenue
 
Year Ended December 31,
 
2014

2015

2016
 
(in thousands)
Traffic acquisition costs
$
(585,492
)

$
(789,152
)

$
(1,068,911
)
Other cost of revenue
(47,948
)
 
(62,201
)
 
(85,260
)
Hosting costs
(24,780
)

(30,428
)

(41,978
)
Depreciation and amortization
(21,455
)

(29,866
)

(38,469
)
Data acquisition
(600
)

(257
)

(122
)
Other cost of sales
(1,113
)

(1,650
)

(4,691
)
Total cost of revenue
$
(633,440
)
 
$
(851,353
)
 
$
(1,154,171
)
Nature of Expenses Allocated to Research and Development
 
Year Ended December 31,
 
2014

2015

2016
 
(in thousands)
Personnel expenses
$
(40,075
)
 
$
(58,075
)
 
$
(86,389
)
Personnel expense excluding equity awards compensation expense and research tax credit
(41,456
)

(54,941
)

(79,222
)
Equity awards compensation expense
(3,682
)

(6,520
)

(12,108
)
Research tax credit
5,063


3,386


4,941

Other cash operating expenses
(14,888
)
 
(21,081
)
 
(29,867
)
Subcontracting and other headcount related costs
(8,218
)

(12,592
)

(14,713
)
Rent and facilities costs
(5,765
)

(7,107
)

(10,939
)
Consulting and professional fees
(765
)

(1,201
)

(2,423
)
Marketing costs
(97
)

(161
)

(953
)
Other
(43
)

(20
)

(839
)
Other non-cash operating expenses
(5,112
)
 
(7,651
)
 
(7,393
)
Depreciation and amortization
(4,949
)

(7,995
)

(7,211
)
Net change in other provisions
(163
)

344


(182
)
Total research and development expenses
$
(60,075
)
 
$
(86,807
)
 
$
(123,649
)

Nature of Expenses Allocated to Sales and Operations
 
Year Ended December 31,
 
2014

2015

2016
 
(in thousands)
Personnel expenses
$
(119,609
)
 
$
(150,426
)
 
$
(185,065
)
Personnel expense excluding equity awards compensation expense
(107,319
)

(138,748
)

(168,227
)
Equity awards compensation expense
(12,290
)

(11,678
)

(16,838
)
Other cash operating expenses
(52,077
)
 
(71,034
)
 
(84,127
)
Subcontracting and other headcount related costs
(17,363
)

(20,856
)

(22,460
)
Rent and facilities costs
(15,684
)

(25,542
)

(29,968
)
Marketing costs
(9,443
)

(12,478
)

(15,225
)
Other
(9,587
)

(12,158
)

(16,474
)
Other non-cash operating expenses
(5,241
)
 
(8,070
)
 
(13,661
)
Depreciation and amortization
(3,664
)

(5,178
)

(7,757
)
Net change in provisions for doubtful receivables
(1,342
)

(2,660
)

(5,433
)
Net change in other provisions
(235
)

(232
)

(471
)
Total sales and operations expenses
$
(176,927
)
 
$
(229,530
)
 
$
(282,853
)
Nature of Expenses Allocated to General and Administrative
 
Year Ended December 31,
 
2014

2015

2016
 
(in thousands)
Personnel expenses
$
(29,734
)
 
$
(37,670
)
 
$
(60,899
)
Personnel expense excluding equity awards compensation expense
(26,106
)

(31,879
)

(46,586
)
Equity awards compensation expense
(3,628
)

(5,791
)

(14,313
)
Other cash operating expenses
(33,430
)
 
(41,814
)
 
(52,867
)
Subcontracting and other headcount related costs
(17,452
)

(19,963
)

(22,990
)
Rent and facilities costs
(4,731
)

(6,475
)

(9,516
)
Consulting and professional fees
(10,094
)

(12,921
)

(18,298
)
Other
(1,153
)

(2,455
)

(2,063
)
Other non-cash operating expenses
(1,559
)
 
339

 
(3,703
)
Depreciation and amortization
(1,145
)

(1,526
)

(3,342
)
Net change in other provisions
(414
)

(353
)

(361
)
Other
—


2,218


—

Total general and administrative expenses
$
(64,723
)
 
$
(79,145
)
 
$
(117,469
)