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Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 38,712 $ 26,584 $ 20,096 $ 24,289
Restricted cash 622 629 626 602
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows $ 39,334 $ 27,213 $ 20,722 $ 24,891