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Summary of Significant Accounting Policies - Schedule of Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Cash and cash equivalents $ 11,252 $ 58,440  
Restricted cash included in other long-term assets 1,097 1,097  
Total cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows $ 12,349 $ 59,537 $ 14,636