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Line of Credit - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Line of Credit Facility [Line Items]          
Outstanding principal amount on line of credit facility $ 3,250,000   $ 3,250,000   $ 4,000,000
Interest expense related to line of credit facility 62,345 $ 72,758 $ 176,207 $ 163,591  
Revolving Credit Note and Loan Agreement with Regions Bank (“Regions”) [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility agreement date     Dec. 15, 2010    
Working capital from loan agreement with Regions Bank $ 15,000,000   $ 15,000,000    
Interest on outstanding principal amount 2.78%   2.78%    
Outstanding principal amount on line of credit facility $ 3,250,000   $ 3,250,000    
Amount available to be borrow under line of credit facility 9,035,449   $ 9,035,449    
Interest rate line of credit facility description     The base rate for any day is the greater of (a) the federal funds rate plus one-half of 1%, (b) Region’s published effective prime rate, or (c) the Eurodollar rate for such day based on an interest period of one month.    
Interest expense related to line of credit facility $ 57,331 $ 65,026 $ 161,642 $ 153,555  
Maturity date of loan agreement with Regions Bank     May 13, 2018    
Revolving Credit Note and Loan Agreement with Regions Bank (“Regions”) [Member] | Base Rate [Member]          
Line of Credit Facility [Line Items]          
Fluctuating interest rate based on base rate     1.50%    
Revolving Credit Note and Loan Agreement with Regions Bank (“Regions”) [Member] | Eligible Accounts Receivable [Member] | Largest Customer [Member]          
Line of Credit Facility [Line Items]          
Percentage of accounts receivable form Quest's customers 80.00%   80.00%    
Revolving Credit Note and Loan Agreement with Regions Bank (“Regions”) [Member] | Eligible Accounts Receivable [Member] | Other Customer [Member]          
Line of Credit Facility [Line Items]          
Percentage of accounts receivable form Quest's customers 85.00%   85.00%