Quarterly report pursuant to Section 13 or 15(d)

Consolidated Financial Statements Details - Additional Information (Detail)

v3.20.1
Consolidated Financial Statements Details - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Condensed Financial Statements, Captions [Line Items]    
Depreciation Expense $ 256 $ 292
Cost of revenues $ 3,811 3,872
Advertising [Member]    
Condensed Financial Statements, Captions [Line Items]    
Percentage of average commission earned on amount invoiced and collected 15.00%  
Gross media placements $ 54,749 52,492
Advertising [Member] | Billed Revenues [Member]    
Condensed Financial Statements, Captions [Line Items]    
Gross media placements 50,050 48,125
Advertising [Member] | Netted Against Billings [Member]    
Condensed Financial Statements, Captions [Line Items]    
Cost of revenues $ 44,499 $ 42,838