Variable Interest Entities (VIEs) - Eliminated Upon Consolidation Included In Accompanying Consolidated Balance Sheets (Details) - USD ($)	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 08, 2017
Current assets
Cash and cash equivalents	$ 103,189,328		$ 106,891,503	$ 99,749,199
Restricted cash – short-term	75,000		0
Investment in marketable securities	116,538,673		1,127,102
Receivables, net	11,003,563		7,734,631
Receivables, net – related party	48,136,313		48,721,325
Other receivables	16,885,448		1,003,133
Prepaid expenses and other current assets	10,315,093		7,385,098
Loans receivable	6,425,000		0
Loans receivable - related parties	16,500,000		0
Total current assets	329,068,418		172,862,792
Noncurrent assets
Land, property and equipment, net			12,721,082
Intangible assets, net	103,011,849		86,875,883
Goodwill	238,505,204		185,805,880	189,847,202	$ 86,197,395
Loans receivable – related parties	0		17,500,000
Investments in other entities – equity method	28,427,455		34,876,980
Restricted cash	746,104		745,470
Operating lease right-of-use assets	14,247,727	$ 9,000,000
Other assets	1,680,689		1,205,962
Total noncurrent assets	399,644,929		340,136,257
Total assets	728,713,347		512,999,049
Current liabilities
Accounts payable and accrued expenses	27,279,579		25,075,489
Fiduciary accounts payable	2,027,081		1,538,598
Medical liabilities	58,724,682		33,641,701	$ 63,972,318
Dividend payable	271,279		0
Bank loan, short-term	0		40,257
Finance lease liabilities	101,741		101,741
Operating lease liabilities	2,990,686
Total current liabilities	105,423,915		72,019,647
Noncurrent liabilities
Deferred tax liability	18,269,448		19,615,935
Liability for unissued equity shares	0		1,185,025
Finance lease liabilities, net of current portion	415,519
Operating lease liabilities, net of current portion	11,372,597
Total noncurrent liabilities	262,229,698		34,318,221
Total liabilities	367,653,613		106,337,868
Variable Interest Entity, Primary Beneficiary
Current assets
Cash and cash equivalents	87,110,226		71,726,342
Restricted cash – short-term	75,000		0
Investment in marketable securities	123,948,391		1,066,103
Receivables, net	9,300,076		4,512,000
Receivables, net – related party	42,976,262		44,651,502
Other receivables	743,757		0
Prepaid expenses and other current assets	7,403,057		3,647,654
Loans receivable	6,425,000		0
Loans receivable - related parties	16,500,000		0
Total current assets	294,481,769		125,603,601
Noncurrent assets
Land, property and equipment, net	9,546,924		9,602,228
Intangible assets, net	81,439,224		58,984,420
Goodwill	108,912,763		56,213,450
Loans receivable – related parties	0		12,500,000
Investments in other entities – equity method	28,486,593		26,707,404
Investment in privately held entities	4,725,000		4,725,000
Restricted cash	746,104		745,470
Operating lease right-of-use assets	4,750,944
Other assets	1,056,828		839,085
Total noncurrent assets	239,664,380		170,317,057
Total assets	534,146,149		295,920,658
Current liabilities
Accounts payable and accrued expenses	11,186,808		6,378,751
Fiduciary accounts payable	2,027,081		1,538,598
Medical liabilities	49,019,200		24,983,110
Income taxes payable	4,529,667		11,621,861
Dividend payable	271,279		0
Amount due to affiliate	28,057,793		11,505,680
Bank loan, short-term	0		40,257
Finance lease liabilities	101,741		101,741
Operating lease liabilities	1,088,260
Total current liabilities	96,281,829		56,169,998
Noncurrent liabilities
Deferred tax liability	14,058,528		15,693,159
Liability for unissued equity shares	0		1,185,025
Finance lease liabilities, net of current portion	415,519		517,261
Operating lease liabilities, net of current portion	3,741,811
Total noncurrent liabilities	18,215,858		17,395,445
Total liabilities	$ 114,497,687		$ 73,565,443