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Reconciliation of Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents presented in the consolidated condensed balance sheets $ 33,677 $ 39,620 $ 65,357 $ 103,172
Restricted cash 2,504      
Cash, cash equivalents and restricted cash presented in the consolidated condensed statements of cash flows $ 36,181 $ 39,620 $ 65,357 $ 103,172