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Line of Credit - Additional Information (Detail) (Revolving Credit Facility [Member], USD $)
12 Months Ended
Dec. 31, 2013
Line of Credit Facility [Line Items]  
Line of credit facility agreement date Dec. 15, 2010
Working capital from loan agreement with Regions Bank $ 10,000,000
Interest on outstanding principal amount 4.75%
Fluctuating interest rate based on base rate 1.50%
Outstanding principal amount on line of credit facility 2,750,000
Amount available to be borrow under line of credit facility $ 7,250,000
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) the Regions published effective prime rate, or (c) the Eurodollar rate for such day based on an interest period of one month.
Line of credit facility expiration date Feb. 13, 2014
Eligible Accounts Receivable [Member] | Largest Customer [Member]
 
Line of Credit Facility [Line Items]  
Percentage of accounts receivable form Quest's customers 60.00%
Eligible Accounts Receivable [Member] | Other Customer [Member]
 
Line of Credit Facility [Line Items]  
Percentage of accounts receivable form Quest's customers 85.00%