Annual report pursuant to Section 13 and 15(d)

Lines Of Credit And Other Borrowings - Additional Information (Detail)

v2.4.0.6
Lines Of Credit And Other Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 24, 2012
May 24, 2012
Comerica Bank
Feb. 28, 2013
Comerica Bank
Subsequent Event
Feb. 28, 2013
Comerica Bank
Subsequent Event
Remaining Amount
Feb. 28, 2011
MidCap Financial Llc and Silicon Valley Bank
May 31, 2010
MidCap Financial Llc and Silicon Valley Bank
Securities
Dec. 31, 2012
Lines of Credit
Dec. 31, 2011
Loan and Security Agreement
Dec. 31, 2010
Loan and Security Agreement
Dec. 31, 2012
Amendment One
Dec. 31, 2012
Domestic Revolver Credit Facility
May 24, 2012
Domestic Revolver Credit Facility
Dec. 31, 2012
Ex-Im Revolver
May 24, 2012
Ex-Im Revolver
Line of Credit Facility [Line Items]                                  
Lines of credit borrowing capacity $ 8,000,000     $ 8,000,000                     $ 4,000,000   $ 4,000,000
Outstanding borrowings under lines of credit 1,600,000                         0   1,600,000  
Interest on principal balance is LIBOR plus                           5.25%   4.25%  
LIBOR floor                           1.00%   1.00%  
Unused capacity commitment fee percentage                           0.25%   0.25%  
Interest Expense incurred for lines of credit and LSA loans                   232,000 293,000 345,000          
Accrued Interest Payable 19,000                                
Amortization of deferred debt issuance costs 91,000                                
Amortization of discount on lines of credit 43,000                                
Annual commitment fee 120,000                                
Total commitment fees paid 240,000                                
Remaining warrants to purchase common stock granted in association with borrowings         80,000   20,000   101,694                
Exercise price of Warrants         2.83       1.77                
Fair value warrants Expected terms                   5 years     4 years 9 months 18 days        
Expiration of unexercised warrants                   May 24, 2017              
Fair value warrants volatility rate                   99.55%     100.37%        
Fair value warrants dividend per share                   $ 0.00     $ 0.00        
Fair value warrants risk free interest rate                   0.77%     0.65%        
Fair value of warrants       135,000                          
Lines of Credit facility expiration Date                   May 01, 2014              
Number of Comerica bank warrants exercised           60,000                      
Net issuance of common stock due to exercise of warrants           30,515                      
Fair value warrants exercise price                   $ 2.83     $ 2.00        
Incremental expense                         7,000        
Number of secured promissory notes issued                 2                
Promissory notes, aggregate principal amount                 3,000,000                
Promissory notes, percentage                 14.25%                
Reduced exercise price of MidCap Financial, LLC warrants         $ 2.00       $ 0.84                
Unregistered Stock Issued               78,172                  
Repayment of lines of credit and loan and security agreement 14,963,000             2,600,000                  
Financed insurance premium 379,000 433,000                              
Number of monthly insurance premium installments payable in 2013 Nine                                
Interest Expense incurred for financed insurance premiums $ 5,000 $ 5,000 $ 5,000                            
Financial insurance premiums interest rate 3.00% 2.50%