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Description of Business and Basis of Preparation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 17, 2014
Mar. 31, 2014
May 07, 2014
Subsequent Event [Member]
Apr. 25, 2014
Subsequent Event [Member]
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   1-for-5.1 reverse stock split
Reverse stock split ratio 0.250     0.196
Number of shares of common stock sold     6,200,000  
Public offering price per share     $ 10  
Net proceeds from initial public offering (IPO)     $ 54.8  
Underwriting discounts and commissions     3.3  
Offering expenses     $ 3.9  
Number of outstanding shares of convertible preferred stock converted into common stock     1,691,884  
Outstanding warrants exercised     275,687