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Segment Information - Geographical Segment Revenue (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 6,497 $ 6,180 $ 12,686 $ 11,840
Domestic [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 1,856 1,772 3,615 3,089
International [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 4,641 $ 4,408 $ 9,071 $ 8,751