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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2014
Stockholders' Equity  
Schedule of conversion of convertible preferred stock

 

   

Year Ended

December 31,

2013

 
Preferred shares exchanged     877,869  
Shares of common stock issued:        
At stated convertible option     53,366  
Incremental shares issued under the exchange transaction     1,631,105  
Total shares of common stock issued     1,684,471  
 
Schedule of warrants outstanding

 

Issued in Connection With  

Expiration

Date

 

Common

Shares

Issuable

   

Weighted

Average

Exercise

Price

 
January 2010 stock issuance   2015     101,785     $ 22.82  
January 2010 stock issuance   2015     100,714     $ 19.95  
October 2010 stock issuance   2015     594,513     $ 13.44  
July 2011 stock issuance   2016     544,117     $ 9.52  
Total         1,341,129     $ 13.05