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Summary of Significant Accounting Policies and Recent Accounting Standards - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Summary of Significant Accounting Policies [Line Items]      
Goodwill impairment $ 7,268    
Goodwill 3,577 $ 10,845  
Restricted Cash and Cash Equivalents $ 204   $ 204