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Trade Receivables & Trade Receivables - Related Parties - Additional Information (Detail) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Accounts Receivable Net Current [Abstract]    
Allowance for doubtful accounts $ 0  
Trade receivables 954,000 $ 973,000
Receivables from related parties $ 2,487,000 $ 2,950,000