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Fair Value Measurements - Schedule of Assets and Liabilities Carried at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Apr. 04, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]              
Cash equivalents $ 15,666   $ 18,649        
Derivative liability 181 500 529 1,000 2,800 4,500 3,800
Warrants 2,626   3,633        
Quoted Prices in Active Markets (Level 1)
              
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]              
Cash equivalents 15,666   18,649        
Derivative liability                
Warrants                
Significant Other Observable Inputs (Level 2)
              
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]              
Cash equivalents                
Derivative liability                
Warrants                
Significant Unobservable Inputs (Level 3)
              
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]              
Cash equivalents                
Derivative liability 181   529        
Warrants $ 2,626   $ 3,633