Stockholders' Equity (Details Textual) (USD $)
 1 Months Ended 2 Months Ended 12 Months Ended 2 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 2 Months Ended 1 Months Ended 2 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 4 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
May 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Oct. 31, 2012
Sep. 30, 2012
Aug. 31, 2012
Mar. 31, 2012
Feb. 28, 2012
Feb. 28, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Market Offering Agreement [Member]
Sep. 30, 2013
Phase One [Member]
Jul. 31, 2013
Phase One [Member]
May 31, 2013
Phase One [Member]
Jul. 31, 2013
Phase Two [Member]
May 31, 2013
Phase Two [Member]
Dec. 31, 2013
Phase Two [Member]
Sep. 30, 2013
Phase three [Member]
Jun. 30, 2013
Phase three [Member]
Sep. 30, 2013
Phase Four [Member]
Jun. 30, 2013
Phase Four [Member]
Sep. 30, 2013
Minimum [Member]
Phase One [Member]
Dec. 31, 2013
Minimum [Member]
Phase Two [Member]
Sep. 30, 2013
Maximum [Member]
Phase One [Member]
Dec. 31, 2013
Maximum [Member]
Phase Two [Member]
Dec. 31, 2013
Warrant [Member]
Dec. 31, 2012
Warrant [Member]
Dec. 31, 2011
Warrant [Member]
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2011
Common Stock [Member]
Apr. 30, 2011
Common Stock [Member]
Mar. 31, 2011
Common Stock [Member]
Dec. 31, 2013
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Sep. 30, 2013
Common Stock [Member]
Phase One [Member]
Mar. 31, 2011
Common Stock [Member]
Minimum [Member]
Mar. 31, 2011
Common Stock [Member]
Maximum [Member]
Sep. 30, 2013
Private Placement [Member]
Phase Four [Member]
Stockholders Equity [Line Items]                                                                                      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value                   $ 1.01 $ 0.49 $ 1.64                               $ 0.82 $ 0.47 $ 0.80 $ 1.14 $ 1.19 $ 2.02                    
Shares Issued Direct Placement         7,000,000     5,200,000                                                                      
Warrants Issued During Period               5,200,000 258,000           942,520     689,675     378,809     648,798 4,000 800,000 340,000                               170,850
Class Of Warrant Or Right Exercise Price Of Warrants Issued         $ 1.25 $ 0.50   $ 1.02 $ 1.25           $ 1.25 $ 1.07   $ 1.25   $ 0.90   $ 2.00   $ 1.08 $ 1.56   $ 2.13                               $ 2.00
Share Price $ 1.07   $ 1.02   $ 1.00 $ 0.40 $ 0.99 $ 1.00 $ 1.25   $ 1.02       $ 1.25   $ 1.02 $ 1.25     $ 1.25 $ 1.60       $ 1.25                             $ 1.10 $ 1.25  
Stock Issued During Period Share From Warrants In Conjunction With Debt Transaction   1,297,607                                                                                  
Proceeds from Issuance of Common Stock         $ 7,000,000 $ 2,760,000   $ 5,200,000         $ 2,895,000                 $ 4,556,000                           $ 1,668,000              
Net proceeds received from issuance     204,000   6,368,000 2,441,000   4,877,000 323,000 43,300,000       1,700,000 1,178,000 433,000 102,000 844,000 730,000   474,000 4,242,000 306,000                                        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights         350,000 300,000 510,821                                                                        
Stock Issued During Period, Shares, New Issues   350,650                                                                           72,440      
Issuance of common stock from warrants exercised (in shares) 440,000   200,000           258,000         1,448,798 942,520 440,000 100,000 689,675 344,000 401,133 378,809 1,423,750 300,000                           5,302,935 200,000 1,468,775        
Common Stock In Public Offering           6,900,000                                                                          
Warrants Expiration Date                 2020-03-31                                                                    
Class of Warrant or Right, Exercise Price of Warrants or Rights                 1.25           1.25 1.25   1.25     1.25   1.02                                        
Stock Issued During Period, Shares, Issued for Services       25,000     180,000                                                     195,814 120,000     174,209          
Warrants Modified During Period                             782,005                                                        
Warrants Forfeited During Period                                       248,867                                              
Stock Issued During Period Shares Placement                                           2,847,500                                          
Stock or Unit Option Plan Expense                   4,498,000                                         14,000                        
Compensation Expenses Unvested stock option term period                                                             1 year 1 month 6 days                        
Compensation Expenses Unvested Restricted Stock term period                   2 years 10 months 24 days                                                                  
Share-based Compensation, Total                   2,331,401 1,610,845 3,333,099                                                              
Stock Issued During Period, Value, New Issues                         1,140,994                                         325,000 240,000                
Warrants Outstanding Value             166,000                                                                        
Warrant Expiration Period             Jan. 06, 2022               Mar. 31, 2020 May 31, 2016   Mar. 31, 2020     Mar. 31, 2020                                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value                   1,170,000 557,000 3,096,000                                     254,000 248,000 256,000                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value                   $ 12,938,385                                   $ 3,550,000 $ 30,000 $ 1,150,000                          
Sale of Stock, Price Per Share                         $ 2.64