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Equity investment - Additional Information (Detail) - USD ($)
10 Months Ended 12 Months Ended
Nov. 01, 2019
Oct. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Oct. 31, 2018
Income/gain from equity investment     $ 1,766,968    
Triad Sedation Associates LLC [Member] | Anesthesia Services [Member]          
Percentage of equity interest         15.00%
Options to acquire additional interest percent       36.00%  
Exercise of options to acquire additional interest percent 36.00%        
Income/gain from equity investment $ 1,318,769 $ 448,199