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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Segment
Dec. 31, 2018
USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Business segment | Segment 2  
Contract assets $ 91 $ 19
Unearned amount to recognize in 2019 4,000  
Unearned amount to recognize in 2020 1,300  
Unearned amount to recognize, thereafter 300  
Revenue from Contract with Customer [Member]    
Basis Of Presentation And Significant Accounting Policies [Line Items]    
Accounts receivable, Net of allowance $ 6,800 $ 6,400