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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