Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Details)

v2.4.0.8
Fair Value Measurements - Financial Liabilities Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability $ 319 $ 210
Fair Value, Measurements, Recurring | Portion at Fair Value Measurement
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability 319 210
Fair Value, Measurements, Recurring | Portion at Fair Value Measurement | Level 3
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability 319 210
Fair Value, Measurements, Recurring | Preferred Stock | Portion at Fair Value Measurement
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability    11
Fair Value, Measurements, Recurring | Preferred Stock | Portion at Fair Value Measurement | Level 1
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability     
Fair Value, Measurements, Recurring | Preferred Stock | Portion at Fair Value Measurement | Level 2
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability     
Fair Value, Measurements, Recurring | Preferred Stock | Portion at Fair Value Measurement | Level 3
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability    11
Fair Value, Measurements, Recurring | Common Stock | Portion at Fair Value Measurement
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability 319 199
Fair Value, Measurements, Recurring | Common Stock | Portion at Fair Value Measurement | Level 3
   
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Warrant liability $ 319 $ 199