Quarterly report pursuant to Section 13 or 15(d)

Summary of Disaggregation of Revenues Related to Geographic Areas (Detail)

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Summary of Disaggregation of Revenues Related to Geographic Areas (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation Of Revenue [Line Items]        
Revenue $ 12,154 $ 12,612 $ 22,174 $ 23,486
United States        
Disaggregation Of Revenue [Line Items]        
Revenue 7,164 8,194 12,857 15,037
International        
Disaggregation Of Revenue [Line Items]        
Revenue $ 4,990 $ 4,418 $ 9,317 $ 8,449