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Consolidated Financial Statements Details - Summary of Net Revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]    
Total net revenues $ 4,388 $ 3,108
Media Agency Revenues [Member]    
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]    
Total net revenues 3,121 2,899
AI Platform Revenues [Member]    
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]    
Total net revenues $ 1,267 $ 209