Segment Information - Geographical Segment Revenue (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||||
---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
Revenues from External Customers and Long-Lived Assets [Line Items] | ||||||||||
Total revenue | $ 5,319 | $ 5,828 | $ 6,180 | $ 5,660 | $ 5,227 | $ 4,914 | $ 5,438 | $ 5,613 | $ 22,987 | $ 21,192 |
Domestic [Member] | ||||||||||
Revenues from External Customers and Long-Lived Assets [Line Items] | ||||||||||
Total revenue | 7,187 | 5,573 | ||||||||
International [Member] | ||||||||||
Revenues from External Customers and Long-Lived Assets [Line Items] | ||||||||||
Total revenue | $ 15,800 | $ 15,619 |