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Eliminated Upon Consolidation Included In Accompanying Consolidated Balance Sheets (Detail) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Current assets        
Cash and cash equivalents $ 93,007,780 $ 106,891,503 $ 103,731,761  
Investment in marketable securities 1,143,006 1,127,102    
Receivables, net 6,640,236 7,127,217    
Prepaid expenses and other current assets 7,984,419 7,385,098    
Total current assets 176,912,063 172,862,792    
Noncurrent assets        
Land, property and equipment, net 12,332,342 12,721,082    
Intangible assets, net 83,056,658 86,875,883    
Goodwill 185,805,880 185,805,880    
Loans receivable – related parties 17,500,000 17,500,000    
Investments in other entities – equity method 34,027,323 34,876,980    
Restricted cash 740,212 745,470 $ 745,293  
Right-of-use asset 8,528,159 0    
Other assets 1,551,359 1,205,962    
Total noncurrent assets 343,946,933 340,136,257    
Total assets 520,858,996 512,999,049    
Current liabilities        
Accounts payable and accrued expenses 47,654,471 25,075,489    
Fiduciary accounts payable 2,084,926 1,538,598    
Medical liabilities 23,265,865 33,641,701   $ 63,972,318
Bank loan 0 40,257    
Lease liabilities 2,461,924 0    
Total current liabilities 88,400,766 72,019,647    
Noncurrent liabilities        
Deferred tax liability 16,992,790 19,615,935    
Liability for unissued equity shares 1,185,025 1,185,025    
Lease liabilities 5,977,145 0    
Total noncurrent liabilities 37,647,070 34,318,221    
Total liabilities 126,047,836 106,337,868    
Variable Interest Entity, Primary Beneficiary [Member]        
Current assets        
Cash and cash equivalents 52,359,206 71,726,342    
Investment in marketable securities 1,074,280 1,066,103    
Receivables, net 3,096,946 3,904,586    
Receivables, net – related party 51,606,081 45,258,916    
Prepaid expenses and other current assets 3,944,518 3,647,654    
Total current assets 112,081,031 125,603,601    
Noncurrent assets        
Land, property and equipment, net 9,400,074 9,602,228    
Intangible assets, net 56,273,585 58,984,420    
Goodwill 56,213,450 56,213,450    
Loans receivable – related parties 12,500,000 12,500,000    
Investment in a privately held entity that does not report net asset value per share 4,725,000 4,725,000    
Investments in other entities – equity method 25,881,231 26,707,404    
Restricted cash 740,212 745,470    
Right-of-use asset 4,216,800 0    
Other assets 1,282,090 839,085    
Total noncurrent assets 171,232,442 170,317,057    
Total assets 283,313,473 295,920,658    
Current liabilities        
Accounts payable and accrued expenses 5,379,342 6,378,751    
Fiduciary accounts payable 2,084,926 1,538,598    
Medical liabilities 21,610,483 24,983,110    
Income taxes payable 12,706,621 11,621,861    
Amount due to affiliate 12,197,167 11,505,680    
Bank loan 0 40,257    
Lease liabilities 840,525 0    
Capital lease obligations 101,741 101,741    
Total current liabilities 54,920,805 56,169,998    
Noncurrent liabilities        
Deferred tax liability 13,360,989 15,693,159    
Liability for unissued equity shares 1,185,025 1,185,025    
Lease liabilities 3,278,928      
Capital lease obligations 492,110 517,261    
Total noncurrent liabilities 18,317,052 17,395,445    
Total liabilities $ 73,237,857 $ 73,565,443