Quarterly report pursuant to Section 13 or 15(d)

Consolidated Financial Statements Details - Additional Information (Detail)

v3.19.1
Consolidated Financial Statements Details - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Depreciation Expense $ 292 $ 49
Cost of revenues $ 3,872 564
Advertising [Member]    
Condensed Financial Statements, Captions [Line Items]    
Percentage of average commission earned on amount invoiced and collected 15.00%  
Gross media placements $ 37,300 29,420
Advertising [Member] | Billed Revenues [Member]    
Condensed Financial Statements, Captions [Line Items]    
Gross media placements 34,731 25,573
Advertising [Member] | Netted Against Billings [Member]    
Condensed Financial Statements, Captions [Line Items]    
Cost of revenues $ 30,425 $ 22,510