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Reconciliation of Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents presented in the consolidated condensed balance sheets $ 222,939 $ 50,443    
Restricted cash 2,505 2,505    
Cash, cash equivalents and restricted cash presented in the consolidated condensed statements of cash flows $ 225,444 $ 52,948 $ 41,269 $ 39,620