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Description of Business and Significant Accounting Policies - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Accounting Policies [Abstract]      
Impairment of goodwill $ 0 $ 0  
Estimated right of use assets 2,489,000   $ 2,709,000
Estimated lease liabilities $ 3,441,000   3,792,000
Deferred rent liability     $ 1,083,000