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Cash, Cash Equivalents, Restricted Cash and Marketable Securities - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 32,073 $ 39,884 $ 49,348  
Restricted cash 237 216 619  
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 32,310 $ 40,100 $ 49,967 $ 27,213