Quarterly report pursuant to Section 13 or 15(d)

Debt Obligations - Additional Information (Detail)

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Debt Obligations - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
May. 07, 2014
Mar. 08, 2013
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Apr. 28, 2015
Dec. 31, 2014
Jun. 30, 2013
Dec. 31, 2011
Apr. 30, 2010
Debt Instrument [Line Items]                      
Loss on extinguishment of debt     $ 0 $ (1,389,000) $ 0 $ (1,389,000)          
Amortization of deferred financing costs     $ 0 219,000 $ 0 755,000          
Number of warrants issued to purchase common stock     14,033   14,033     14,033      
Exercise price of warrants $ 10.00           $ 7.7000        
2010 Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Credit facility agreement amount                     $ 15,000,000
2013 Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Deemed contribution of a loan guarantee   $ 3,930,000                  
Outstanding debt plus accrued interest $ 15,000,000                    
Loss on extinguishment of debt       1,389,000              
Debt outstanding     $ 0   $ 0     $ 0      
Amortization of deferred financing costs     0 $ 219,000 0 $ 755,000          
December 2011 Note and Warrant Agreement [Member]                      
Debt Instrument [Line Items]                      
Debt agreement, maximum borrowing capacity                   $ 15,000,000  
2011-2012 Notes [Member]                      
Debt Instrument [Line Items]                      
Exercise price of warrants                   $ 0.20  
Convertible notes aggregate amount     0   0     0      
Interest payable     0   0     0      
June 2013 Note and Warrant Agreement [Member]                      
Debt Instrument [Line Items]                      
Debt agreement, maximum borrowing capacity                 $ 1,500,000    
Convertible notes aggregate amount     0   0     0 $ 899,000    
Interest payable     $ 0   $ 0     $ 0      
Investor [Member] | 2011-2012 Notes [Member]                      
Debt Instrument [Line Items]                      
Number of warrants issued to purchase common stock                   26,000  
Convertible notes aggregate amount                   $ 11,444,000  
Term Loan [Member] | 2010 Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Credit facility agreement amount                     5,000,000
Revolving Credit Facility [Member] | 2010 Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Credit facility agreement amount                     $ 10,000,000
London Interbank Offered Rate (LIBOR) [Member] | 2010 Credit Agreement [Member]                      
Debt Instrument [Line Items]                      
Interest at a rate of London InterBank plus                     0.95%