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Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 112,133 $ 49,348 $ 36,067 $ 26,584
Restricted cash 615 619 635 629
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows $ 112,748 $ 49,967 $ 36,702 $ 27,213