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Long-term debt and Capital Lease Obligation - Additional Information (Detail) - USD ($)
12 Months Ended
Apr. 24, 2017
Dec. 06, 2015
Dec. 31, 2018
Apr. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
Mar. 01, 2018
Dec. 31, 2017
Property Subject to or Available for Operating Lease [Line Items]                
Debt Instrument, Outstanding balance     $ 5,817,308          
Capital lease obligations, Equipment     $ 651,000 $ 178,942   $ 461,506   $ 252,000
Capital lease obligations, Value of Company's trade-in of existing equipment       $ 22,000   $ 129,300    
Revolving Credit Facility [Member]                
Property Subject to or Available for Operating Lease [Line Items]                
Debt Instrument, Basis spread on variable rate 3.00%              
Debt Instrument, Description of variable rate basis     one month LIBOR index.          
Line of Credit Facility, Maximum borrowing capacity $ 1,500,000              
Line of Credit Facility, Expiration date     Dec. 06, 2020          
Line of Credit Facility, Interest rate description     Amounts borrowed under the revolving line of credit will bear interest at 3% over the one month LIBOR index.          
Notes Payable To Third Parties [Member] | Term Note [Member]                
Property Subject to or Available for Operating Lease [Line Items]                
Debt Instrument, Principal balance   $ 4,875,000            
Debt Instrument, Advance of additional borrowings   2,000,000            
Debt Instrument, Expiration date     Dec. 06, 2020          
Debt Instrument, Outstanding balance     $ 5,817,308          
Debt Instrument, Monthly principal payment   $ 29,380            
Debt Instrument, Basis spread on variable rate   3.00%            
Debt Instrument, Effective rate     5.32%          
Debt Instrument, Interest rate term description     3% over the one month Libor index (5.38% at December 31, 2018)          
Debt Instrument, Description of variable rate basis     one month Libor index          
Debt Instrument, Debt service ratio   1.25%            
Debt Instrument, Debt service ratio description     The term note requires the Company to maintain a Debt Service Ratio, as defined, of 1.25%.          
Capital Lease 5 [Member] | Equipment [Member]                
Property Subject to or Available for Operating Lease [Line Items]                
Capital lease obligations, Equipment     $ 284,038       $ 332,206  
Capital lease obligations, Expiration     2023-02          
Capital lease obligations, Monthly payments             $ 6,500  
Capital lease obligations, Interest rate             6.50%  
Capital lease obligations, Frequency of periodic payment     Monthly          
Capital lease obligations, Cost of leased assets             $ 461,506  
Capital lease obligations, Value of Company's trade-in of existing equipment             $ 129,300  
Capital Lease 6 [Member] | Equipment [Member]                
Property Subject to or Available for Operating Lease [Line Items]                
Capital lease obligations, Equipment     $ 136,520   $ 156,942      
Capital lease obligations, Expiration     2023-03          
Capital lease obligations, Monthly payments         $ 3,071      
Capital lease obligations, Interest rate         6.50%      
Capital lease obligations, Frequency of periodic payment     Monthly          
Capital lease obligations, Cost of leased assets         $ 178,942      
Capital lease obligations, Value of Company's trade-in of existing equipment         $ 22,000