Trade and Other Receivables - Summary of Trade Receivables and Other Receivable (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Line Items]
Trade receivables, gross	$ 20,024,916	$ 19,373,260
Other receivables	50,756	141,141
Less: allowance for doubtful accounts	(34,384)	(46,598)
Receivables net current	20,041,288	19,467,803
Anesthesia Services [Member]
Balance Sheet Related Disclosures [Line Items]
Trade receivables, gross	19,081,177	18,199,847
Product Sales [Member]
Balance Sheet Related Disclosures [Line Items]
Trade receivables, gross	$ 943,739	$ 1,173,413

Balance Sheet Related Disclosures [Line Items]

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Amount due from parties in nontrade transactions, classified as other.

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