Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.0.6
Subsequent Events - Additional Information (Detail) (USD $)
1 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Domestic Revolver Credit Facility
Dec. 31, 2012
Domestic Revolver Credit Facility
Mar. 31, 2013
Ex-Im Revolver
Dec. 31, 2012
Ex-Im Revolver
May 07, 2013
Subsequent Event
Apr. 26, 2013
Subsequent Event
Affiliation Agreement
May 07, 2013
Subsequent Event
Domestic Revolver Credit Facility
May 07, 2013
Subsequent Event
Ex-Im Revolver
Subsequent Event [Line Items]                  
Lines of credit current borrowing capacity               $ 4,000,000  
Lines of credit borrowing capacity 8,000,000   4,000,000   4,000,000 10,000,000   6,000,000  
Commitment fee percent               1.50%  
Commitment fee               30,000  
Increase additional borrowing capacity               $ 2,000,000  
Prime rate   3.25%              
Interest on principal balance is prime plus               2.00% 1.50%
Reduction in interest rates               1.00% 0.50%
LIBOR floor   1.00%   1.00%       2.50% 2.50%
Warrants issued to purchase common stock             500,000    
Exercise price of warrants             5.90    
Warrant vesting rate             1,000    
Warrant expiration date             Apr. 24, 2014