Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition - Additional Information (Detail)

v3.19.3
Revenue Recognition - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Segment
Dec. 31, 2018
Market
Disaggregation of Revenue [Line Items]    
Prepaid commission expense | $ $ 0.6  
Number of operating segments | Segment 3  
Number of market locations | Market   35
Minimum [Member]    
Disaggregation of Revenue [Line Items]    
Sale of subscription revenue term 3 months  
Maximum [Member]    
Disaggregation of Revenue [Line Items]    
Sale of subscription revenue term 2 years