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Note Payable (MidCap Loan) - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
May 29, 2015
Jun. 30, 2016
May 05, 2016
Mid Cap [Member]      
Debt Instrument [Line Items]      
Exercise price of warrants to purchase common stock   $ 3.53  
Secured Loan Facility [Member]      
Debt Instrument [Line Items]      
Term of loan   42 months  
Interest rate   8.45%  
LIBOR floor rate   0.50%  
Principal payment per month   $ 1.3  
Closing fee from the prior loan $ 0.4    
Final payment fee rate   2.75%  
Loan amount prepaid in the first year following execution of credit agreement   5.00%  
Loan amount prepaid in each year thereafter   3.00%  
Interest rate at period end   8.95%  
Exit fee percentage recorded as deferred loan costs   2.75%  
Secured Loan Facility [Member] | Mid Cap [Member]      
Debt Instrument [Line Items]      
Secured loan facility 30.0    
Net proceeds in aggregate amount $ 20.1    
Rate of interest applicable to obligations   4.00%  
Number of warrants to purchase common stock     84,986
Exercise price of warrants to purchase common stock     $ 3.53
Loan, gross   $ 29.1  
Unamortized discount   $ 0.9