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Shareholders' Equity Equity Issuances (Details) - USD ($)
 1 Months Ended 9 Months Ended 12 Months Ended 22 Months Ended
Nov. 30, 2015
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
May. 01, 2015
Jun. 30, 2014
May. 08, 2014
Mar. 31, 2014
Class of Stock [Line Items]                    
Common stock, shares, issued (shares)                 5,329,593  
Proceeds from issuance of common stock     $ 36,471,269 $ 16,710,645 $ 58,736,166          
March 2014 Purchase Agreement [Member]                    
Class of Stock [Line Items]                    
Stock Issued During Period, Shares, Other           5,100,000        
Stock Issued During Period, Shares, New Issues     3,000,000              
Proceeds from issuance of common stock     $ 9,400,000     $ 20,300,000        
Common Stock [Member]                    
Class of Stock [Line Items]                    
Stock Issued During Period, Shares, Other   12,500,000                
Fair Value Inputs, Offered Quotes   $ 2.00                
Proceeds from issuance of common stock   $ 28,800,000                
Over-Allotment Option [Member]                    
Class of Stock [Line Items]                    
Stock Issued During Period, Shares, Other   1,875,000                
Aspire Capital Purchase Agreement [Member]                    
Class of Stock [Line Items]                    
Stock Issued During Period, Shares, Other 842,696   200,000              
Term Of Agreement In Months 24 months                  
Discount Applied To Weighted Average Price 5.00%                  
Proceeds from issuance of common stock     $ 300,000              
Purchase Commitment, Remaining Minimum Amount Committed $ 30,000,000                  
Purchase Commitment, Maximum Amount Committed, Shares 11,019,276                  
May 2015 Aspire Capital Purchase Agreement [Member]                    
Class of Stock [Line Items]                    
Common stock, shares, issued (shares)   364,837                
Purchase Commitment, Remaining Minimum Amount Committed             $ 30,000,000     $ 30,000,000
Aspire Capital Purchase Agreement [Member]                    
Class of Stock [Line Items]                    
Common stock, shares, issued (shares)               150,000