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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 37,297 $ 49,348 $ 38,712 $ 26,584
Restricted cash 619 619 622 629
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows $ 37,916 $ 49,967 $ 39,334 $ 27,213