Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.8
Lines of Credit and Other Borrowings - Additional Information (Detail) (USD $)
12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
May 24, 2012
May 07, 2013
Prime rate
Dec. 31, 2013
Line of Credit
Dec. 31, 2012
Line of Credit
Dec. 31, 2011
Loan And Security Agreement
Mar. 04, 2014
Subsequent Event
Mar. 04, 2014
Comerica Bank
Subsequent Event
Dec. 31, 2012
2012 Comerica Warrant
Dec. 31, 2013
September 2013 Comerica Warrant
Sep. 06, 2013
September 2013 Comerica Warrant
Dec. 31, 2013
November 2013 Comerica Warrant
Nov. 08, 2013
November 2013 Comerica Warrant
Feb. 28, 2011
MidCap Financial Llc and Silicon Valley Bank
May 31, 2010
MidCap Financial Llc and Silicon Valley Bank
Securities
Dec. 31, 2013
Domestic Revolver Credit Facility
May 24, 2012
Domestic Revolver Credit Facility
May 07, 2013
Domestic Revolver Credit Facility
Prime rate
Dec. 31, 2013
Ex-Im Revolver
May 24, 2012
Ex-Im Revolver
May 07, 2013
Ex-Im Revolver
Prime rate
Line Of Credit Facility [Line Items]                                              
Lines of credit maximum borrowing capacity       $ 8,000,000         $ 5,000,000                   $ 4,000,000     $ 4,000,000  
Outstanding borrowings under lines of credit 4,600,000                                 1,800,000     2,800,000    
Line of credit facility, expiration date May 01, 2014                                            
Interest on principal balance rate plus                                       2.00%     1.50%
Prime Floor, daily prime plus LIBOR         2.50%                                    
Unused capacity commitment fee percentage           0.25%                                  
Interest expense incurred for lines of credit and loan and security agreement           599,000 232,000 293,000                              
Amortization of deferred debt issuance costs 197,000 91,000                                          
Amortization of discount on lines of credit 179,000 43,000                                          
Accrued Interest Payable 20,000 19,000                                          
Credit Agreements amendment fee                   10,000                          
Annual commitment fee   120,000                                          
Total commitment fees paid   240,000                                          
Additional commitment fees and legal costs incurred 67,000                                            
Warrants issued to purchase common stock                     80,000   100,000   100,000   101,694            
Warrants price of warrants                     2.83   2.00   2.00   1.77            
Reduced exercise price of warrants                     $ 2.00           $ 0.84            
Expiration date of warrant shares if unexercised                     May 24, 2017 Sep. 06, 2018   Nov. 08, 2018     May 26, 2015            
Number of Comerica Bank warrants exercised                     80,000                        
Fair value of warrants                     142,000 143,000   137,000                  
Net issuance of common stock due to exercise of warrants                     40,465                        
Fair value warrants expected term                       5 years   5 years                  
Fair value warrants volatility rate                       105.32%   102.65%                  
Fair value warrants dividend per share                       $ 0.00   $ 0.00                  
Fair value warrants risk free interest rate                       1.77%   1.42%                  
Number of secured promissory notes issued                                 2            
Promissory notes, aggregate principal amount                                 3,000,000            
Promissory notes, percentage                                 14.25%            
Repayment of lines of credit and loan and security agreement 32,104,000 14,963,000                           2,600,000              
Unregistered Stock Issued                               78,172              
Financed insurance premium 197,000 379,000                                          
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 2.90% 3.00%