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Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash And Cash Equivalents [Abstract]        
Cash and savings accounts $ 57,736 $ 59,302    
Time deposits 7 6    
Cash and cash equivalents reported on the consolidated balance sheets 57,743 59,308    
Cash restricted as performance bond 531 518    
Total cash, cash equivalents and restricted cash reported on the consolidated statements of cash flows $ 58,274 $ 59,826 $ 64,177 $ 66,211