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Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 49,348 $ 26,584 $ 24,289  
Restricted cash 619 629 602  
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 49,967 $ 27,213 $ 24,891 $ 45,421