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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Cash and cash equivalents $ 26,184 $ 11,252  
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 $ 27,281 $ 12,349 $ 59,537