Description of Business and Summary of Significant Accounting Policies (Details 4) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Numerator:    
Net loss $ (539) $ (1,471)
Denominator:    
Weighted average common stock outstanding for basic net loss per common share (in shares) 23,117 2,502
Weighted average common shares and dilutive securities outstanding 23,117 2,502
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share    
Total (in shares) 4,853 20,658
Convertible preferred stock
    
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share    
Total (in shares)   15,294
Options to purchase common stock
    
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share    
Total (in shares) 4,853 4,629
Warrants to purchase common stock
    
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share    
Total (in shares)   541
Warrants to purchase preferred stock
    
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share    
Total (in shares)   194