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Summary of Significant Accounting Policies and Recent Accounting Standards - Cash and Restricted Cash (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 27,879 $ 2,563 $ 3,806  
Restricted Cash 204   204  
Total cash, cash equivalents and restricted cash in the statement of cash flows $ 28,083 $ 2,767 $ 4,010 $ 3,754