Quarterly report pursuant to Section 13 or 15(d)

Consolidated Financial Statements Details - Additional Information (Detail)

v3.19.3
Consolidated Financial Statements Details - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]        
Depreciation Expense $ 271 $ 236 $ 822 $ 451
Cost of revenues 4,757 1,570 $ 13,191 2,953
Advertising [Member]        
Condensed Financial Statements, Captions [Line Items]        
Percentage of average commission earned on amount invoiced and collected     15.00%  
Gross media placements 55,799 42,087 $ 158,370 102,959
Advertising [Member] | Billed Revenues [Member]        
Condensed Financial Statements, Captions [Line Items]        
Gross media placements 51,429 34,521 147,989 86,416
Advertising [Member] | Netted Against Billings [Member]        
Condensed Financial Statements, Captions [Line Items]        
Cost of revenues $ 45,668 $ 30,225 $ 131,345 $ 75,690