Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Basis of Preparation - Additional Information (Detail)

v3.2.0.727
Description of Business and Basis of Preparation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
6 Months Ended
Apr. 28, 2015
USD ($)
$ / shares
shares
May. 31, 2014
shares
May. 07, 2014
USD ($)
$ / shares
shares
Apr. 25, 2014
Mar. 17, 2014
Jun. 30, 2015
shares
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Formation date           Nov. 04, 1999
Reverse stock split ratio, description         1-for-4 reverse stock split  
Reverse stock split ratio         0.25  
Number of shares of common stock sold | shares 5,376,622   6,200,000     5,376,622
Public offering price per share | $ / shares $ 7.7000   $ 10.00      
Net proceeds from initial public offering (IPO)     $ 54,583      
Underwriting discounts and commissions     3,290      
Offering expenses     $ 4,127      
Number of outstanding shares of convertible preferred stock converted into common stock | shares     1,691,884      
Outstanding warrants exercised | shares   275,687 275,687      
Proceeds from public offerings $ 38,012          
Underwriting fees and offering costs $ 3,388          
Additional Reverse Stock Split [Member]            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Reverse stock split ratio, description       1-for-5.1 reverse stock split    
Reverse stock split ratio       0.196    
2013 Credit Agreement [Member]            
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]            
Repayment of debt     $ 15,000