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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2014
Stockholders Equity Tables  
Preferred Stock
    Number of Shares Issued              
    and Outstanding as of              
   

June 30,

2014

    

December 31,

2013

     Par Value     Conversion Ratio  
Series "A"     -       -     $ 0.0001       N/A  
Series "B"     -       1       0.0050     4:1  
Series "C"     1       1       0.0001     1:1  
Series “D"     4,725       1,227,582       0.0001     10:1  
Series “D-1"     68,638       59,265       0.0001     10:1  
Series “F-1"     -       156,250       0.0001     1:1  
Series “H"     439,043       459,043       0.0001     10:1  
Series “I”     35,541       119,760       0.0001     20:1  
Series “J”     -       -       0.0001     1:1  
                                 
Summary of warrant activity
    Warrants     Weighted Average Exercise Price     Total Intrinsic Value  
Outstanding as of December 31, 2013     65,263     $ 5.83       -  
Issued     711,355       5.90          
Cancelled     (1,597 )     28.00          
Outstanding as of June 30, 2014     775,021     $ 5.85     $ -  
Fair value of stock-based compensation
    For the Six Months ended  
    June 30, 2014  
Exercise price   $ 1.94 - $5.83  
Expected stock price volatility     78.9% - 90.6 %
Risk-free rate of interest     0.76% - 1.71 %
Term (years)     2.5 - 5.5  
Summary of option activity

    Number of Shares     Weighted Average Exercise Price     Total Intrinsic Value     Weighted Average Remaining Contractual Life (in years)  
Outstanding as of December 31, 2013     1,983,877     $ 7.14     $ -       -  
Employee options granted     2,235,000       4.52                  
Outstanding as of June 30, 2014     4,218,877       5.75       -       6.8  
Options vested and expected to vest     4,218,877       5.75       -       6.8  
Options vested and exercisable     3,451,714     $ 6.01     $ -       6.9  

 
Summary of the restricted stock award activity
    Number of Units     Weighted Average Grant Day Fair Value  
Nonvested at Decemeber 31, 2013     250     $ 6.83  
Granted     109,285       1.82  
Vested     (99,535 )     1.67  
Nonvested at June 30, 2014     10,000     $ 3.49  
Stock-based compensation
   

For the Three Months

Ended June 30,

    

For the Six Months

 Ended June 30,

  
    2014     2013     2014     2013  
Employee restricted stock awards   $ 12     $ 3     $ 14     $ 6  
Employee stock option awards     6,757       1       10,150       2  
Non-employee restricted stock awards     175       -       176       -  
Non-employee option awards     48       -       48       -  
Total compensation expense   $ 6,992     $ 4     $ 10,388     $ 8