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
Mar. 31, 2018
Mar. 31, 2017
Disaggregation Of Revenue [Line Items]    
Revenue $ 10,020 $ 10,874
United States    
Disaggregation Of Revenue [Line Items]    
Revenue 5,693 6,843
International    
Disaggregation Of Revenue [Line Items]    
Revenue $ 4,327 $ 4,031