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Net Loss Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Summary of basic and diluted loss per share          
Net loss $ (2,405) $ (1,199) $ (4,794) $ (2,270) $ (6,939)
Less: Deemed preferred stock dividend   (2,026)   (2,026) 2,026
Net loss available to common stockholders $ (2,405) $ (3,225) $ (4,794) $ (4,296)  
Weighted average shares of common stock outstanding 21,009,712 4,946,932 19,903,709 3,998,704  
Less: Weighted-average shares of unvested common stock   (2,783)   (2,783)  
Total weighted-average shares used in computing net loss per share attributed to common stockholders 21,009,712 4,944,149 19,903,709 3,995,921  
Basic and diluted loss per share $ (0.11) $ (0.65) $ (0.24) $ (1.08)