Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands |
9 Months Ended | |
---|---|---|
Sep. 30, 2019 |
Dec. 31, 2018 |
|
Revenue Recognition [Abstract] | ||
Period of revenue from services | 1 month | |
Subscription revenue term, minimum | 1 year | |
Subscription revenue term, maximum | 3 years | |
Aggregate amount of transaction price from contractual obligations | $ 15,770 | $ 17,496 |