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Stockholders Equity (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Oct. 31, 2013
May 31, 2012
Jun. 30, 2009
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Minimum [Member]
Mar. 31, 2014
Maximum [Member]
Mar. 31, 2014
2004 Stock Incentive Plan [Member]
Mar. 31, 2014
2009 Stock Incentive Plan [Member]
Mar. 31, 2014
Stock Options [Member]
Mar. 31, 2013
Stock Options [Member]
Mar. 31, 2014
Restricted Stock [Member]
Mar. 31, 2013
Restricted Stock [Member]
May 31, 2012
2012 Warrants [Member]
Mar. 31, 2014
2012 Warrants [Member]
Jun. 30, 2009
2009 Warrants [Member]
Mar. 31, 2014
2009 Warrants [Member]
Oct. 31, 2013
2013 Warrants [Member]
Mar. 31, 2014
2013 Warrants [Member]
Apr. 30, 2014
2013 Warrants [Member]
Subsequent Event [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]
Mar. 31, 2014
CEFF [Member]
Terrapin Opportunity, L.P. [Member]
Mar. 31, 2013
Sales Agreement December 2011 [Member]
Cowen and Company, LLC [Member]
Mar. 31, 2014
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-eight (1:8) one-for- sixteen (1:16)                                    
Common stock, shares authorized (in shares)       170,000,000   170,000,000                                        
Common stock, par value (in dollars per share)       $ 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                                           $ 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  
Common stock sold through the program (in shares) 1,300,000 1,000,000 100,000                                     1,000,000 1,000,000 500,000 900,000  
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        
Remaining value of common stock       94,000 [1]   84,000 [1]                                        
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   $ 2.56     $ 7.04          
Number of warrants outstanding (in shares)                               300,000   40,000                
Term period for warrants                               3 years   5 years   5 years            
Warrants Exercised (in shares)                               13,000   25,000                
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       178,000 467,000           178,000 467,000                            
Restricted stock compensation expense       $ 42,000 $ 197,000               $ 42,000 $ 197,000                        
[1] Reflects a one-for- sixteen (1:16) reverse stock split effected on April 8, 2014.