Quarterly report pursuant to Section 13 or 15(d)

Lines of Credit and Other Borrowings - Additional Information (Detail)

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Lines of Credit and Other Borrowings - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Line of Credit Facility [Line Items]    
Lines of credit borrowing capacity $ 8,000,000  
Outstanding borrowings under lines of credit 3,300,000  
Accrued Interest Payable 18,000  
Amortization of deferred debt issuance costs 38,000  
Amortization of discount on lines of credit 18,000  
Financed insurance premium 212,000  
Number of monthly insurance premium installments payable in 2013 Nine  
Financial insurance premiums interest rate 3.00%  
Interest expense incurred for financed insurance premiums 2,000  
Lines of Credit
    
Line of Credit Facility [Line Items]    
Interest expense incurred for lines of credit 84,000  
Comerica Bank
    
Line of Credit Facility [Line Items]    
Remaining warrants to purchase common stock granted in association with borrowings   80,000
Exercise price of warrants   2.00
Number of Comerica Bank warrants exercised 80,000  
Net issuance of common stock due to exercise of warrants 40,465  
Domestic Revolver Credit Facility
    
Line of Credit Facility [Line Items]    
Lines of credit borrowing capacity   4,000,000
Outstanding borrowings under lines of credit 1,800,000  
Interest on principal balance is LIBOR plus 5.25%  
LIBOR floor 1.00%  
Unused capacity commitment fee percentage 0.25%  
Ex-Im Revolver
    
Line of Credit Facility [Line Items]    
Lines of credit borrowing capacity   4,000,000
Outstanding borrowings under lines of credit $ 1,500,000  
Interest on principal balance is LIBOR plus 4.25%  
LIBOR floor 1.00%  
Unused capacity commitment fee percentage 0.25%