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Segment information - Schedule of Information Regarding Services and Performance Marketing Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue:                      
Revenue $ 59,230 $ 57,248 $ 53,024 $ 50,766 $ 54,193 $ 52,176 $ 41,043 $ 39,424 $ 220,268 $ 186,836 $ 14,091
Loss (income) from operations:                      
Operating income (loss) (2,387) $ (11,669) $ (17,964) $ (10,498) (5,653) $ (12,357) $ (7,856) $ (8,172) (42,518) (34,038) (44,400)
Depreciation and amortization:                      
Depreciation and amortization                 14,193 12,631 841
Write-off of long-lived assets                      
Write-off of long-lived assets                 3,626 4,055  
Share-based compensation expense:                      
Share-based compensation expense                 33,996 29,249 34,160
ASSETS:                      
Assets 316,999       311,911       316,999 311,911  
Intangible assets, net:                      
Intangible assets, net 89,707       98,531       89,707 98,531  
Goodwill:                      
Goodwill 166,256       166,256       166,256 166,256  
Operating Segments [Member]                      
Revenue:                      
Revenue                 220,268 186,836 14,091
Loss (income) from operations:                      
Operating income (loss)                 (17,764) (15,123) (13,737)
Depreciation and amortization:                      
Depreciation and amortization                 14,193 12,631 841
Write-off of long-lived assets                      
Write-off of long-lived assets                 3,626 4,055  
Share-based compensation expense:                      
Share-based compensation expense                 17,764 15,283 4,775
Capital expenditure:                      
Capital expenditure                 8,127 10,926 3,977
ASSETS:                      
Assets 314,416       308,103       314,416 308,103  
Intangible assets, net:                      
Intangible assets, net 89,707       98,531       89,707 98,531  
Goodwill:                      
Goodwill 166,256       166,256       166,256 166,256  
Corporate [Member]                      
Loss (income) from operations:                      
Operating income (loss) [1]                 (24,754) (18,915) (30,663)
Share-based compensation expense:                      
Share-based compensation expense [1]                 16,232 13,966 29,385
ASSETS:                      
Assets [2] 2,583       3,808       2,583 3,808  
Information Services [Member] | Operating Segments [Member]                      
Revenue:                      
Revenue                 78,365 55,454 6,413
Loss (income) from operations:                      
Operating income (loss)                 (23,594) (25,568) (13,721)
Depreciation and amortization:                      
Depreciation and amortization                 6,739 5,894 481
Write-off of long-lived assets                      
Write-off of long-lived assets                 1,189 4,055  
Share-based compensation expense:                      
Share-based compensation expense                 13,225 11,950 4,521
Capital expenditure:                      
Capital expenditure                 7,117 9,804 3,977
ASSETS:                      
Assets 119,946       110,166       119,946 110,166  
Intangible assets, net:                      
Intangible assets, net 52,259       52,424       52,259 52,424  
Goodwill:                      
Goodwill 44,178       44,178       44,178 44,178  
Performance Marketing [Member] | Operating Segments [Member]                      
Revenue:                      
Revenue                 141,903 131,382 7,678
Loss (income) from operations:                      
Operating income (loss)                 5,830 10,445 (16)
Depreciation and amortization:                      
Depreciation and amortization                 7,454 6,737 360
Write-off of long-lived assets                      
Write-off of long-lived assets                 2,437    
Share-based compensation expense:                      
Share-based compensation expense                 4,539 3,333 $ 254
Capital expenditure:                      
Capital expenditure                 1,010 1,122  
ASSETS:                      
Assets 194,470       197,937       194,470 197,937  
Intangible assets, net:                      
Intangible assets, net 37,448       46,107       37,448 46,107  
Goodwill:                      
Goodwill $ 122,078       $ 122,078       $ 122,078 $ 122,078  
[1] Corporate primarily represents corporate administrative costs that are not allocated to individual segments. The segment information for the years ended December 31, 2016 and 2015 was reclassified to conform to the current period presentation.
[2] Assets of corporate primarily represents corporate’s assets that are not allocated to individual segments. The segment information as of December 31, 2016 was reclassified to conform to the current period presentation