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Stockholders Equity (Details) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended 9 Months Ended 3 Months Ended 12 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2013
May 31, 2012
Jun. 30, 2009
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Nov. 04, 2014
Subsequent Event [Member]
Sep. 30, 2014
2004 Stock Incentive Plan [Member]
Sep. 30, 2014
2009 Stock Incentive Plan [Member]
Sep. 30, 2014
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2014
Stock Options [Member]
Sep. 30, 2013
Stock Options [Member]
Sep. 30, 2014
Restricted Stock [Member]
Sep. 30, 2013
Restricted Stock [Member]
Sep. 30, 2014
Restricted Stock [Member]
Sep. 30, 2013
Restricted Stock [Member]
May 31, 2012
2012 Warrants [Member]
Sep. 30, 2014
2012 Warrants [Member]
Jun. 30, 2009
2009 Warrants [Member]
Jun. 30, 2014
2009 Warrants [Member]
Oct. 31, 2013
2013 Warrants [Member]
Sep. 30, 2014
2013 Warrants [Member]
Mar. 31, 2014
Sales Agreement March 2013 [Member]
Cowen and Company, LLC [Member]
Dec. 31, 2013
Sales Agreement March 2013 [Member]
Cowen and Company, LLC [Member]
Sep. 30, 2014
Sales Agreement March 2013 [Member]
Cowen and Company, LLC [Member]
Sep. 30, 2014
CEFF [Member]
Terrapin Opportunity, L.P. [Member]
Mar. 31, 2013
Sales Agreement December 2011 [Member]
Cowen and Company, LLC [Member]
Sep. 30, 2013
Sales Agreement December 2011 [Member]
Cowen and Company, LLC [Member]
Dec. 31, 2013
Sales Agreement December 2011 [Member]
Cowen and Company, LLC [Member]
Stock Issuances [Abstract]                                                                
Reverse stock split ratio       one-for- sixteen (1:16) one-for- sixteen (1:16) one-for- sixteen (1:16) one-for- sixteen (1:16) one-for- sixteen (1:16)                                                
Common stock, shares authorized (in shares)       170,000,000   170,000,000   170,000,000                                                
Common stock, par value (in dollars per share)       $ 0.01   $ 0.01   $ 0.01                                                
Common stock, par value under sales agreement (in dollars per share)                                                       $ 0.01       $ 0.01
Proceeds from issuance of common stock                 $ 400,000                                 $ 4,400,000 $ 5,000,000   $ 11,100,000   $ 20,900,000  
Proceeds of common stock issued, net of related expenses                                                   4,400,000 4,800,000   10,800,000   20,800,000  
Number of shares of common stock remaining for sale under the offering program                                                           0    
Common stock sold through the program (in shares) 1,300,000 1,000,000 100,000           300,000                                 1,000,000 1,000,000   500,000 14,200,000    
Aggregate proceeds from sale of common stock under equity offering program, maximum                                                       50,000,000       39,800,000
Aggregate proceeds from sale of common stock under equity offering program, remaining                                                       40,400,000        
Amount to be purchased by party under agreement                                                         35,000,000      
Term of purchase agreement                                                         24 months      
Amount available under committed equity financing facility                                                         23,900,000      
Warrant [Abstract]                                                                
Warrants issued (in shares)                                       300,000   100,000   600,000                
Proceeds from issuance of private placement 7,500,000 21,500,000 3,000,000                                                          
Net proceeds from issuance of private placement 6,900,000 21,100,000 2,700,000                                                          
Estimated fair value allocated to warrants issued                                       3,400,000   2,200,000   1,900,000                
Warrants exercisable per share price (in dollars per share)                                         $ 2.56       $ 7.04              
Number of warrants outstanding (in shares)                                         260,000       600,000              
Term period for warrants                                         3 years   5 years   5 years              
Warrants Exercised (in shares)                                         14,000   35,000   0              
Net proceeds from exercise of warrants                                         34,000   100,000                  
Stock Incentive Plans [Abstract]                                                                
Shares reserved for the issuance (in shares)                   187,500 406,250                                          
Maximum term of options                           10 years                                    
Recognized compensation expense           321,000 407,000         100,000   300,000 400,000                                  
Recognized compensation income                         200,000                                      
Restricted stock compensation expense           96,000 179,000                 40,000   100,000 200,000                          
Restricted stock income                                 $ 100,000