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Stockholders' Equity (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 16, 2016
shares
Aug. 27, 2015
USD ($)
shares
May 08, 2015
USD ($)
May 31, 2015
USD ($)
Closing
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
USD ($)
Jun. 15, 2016
$ / shares
shares
May 10, 2016
shares
Mar. 31, 2016
shares
Dec. 17, 2015
shares
Mar. 31, 2015
USD ($)
Preferred Stock [Abstract]                          
Preferred stock, shares authorized (in shares)         5,000,000                
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001                
Common Stock [Abstract]                          
Number of shares callable by warrants (in shares)                 1 1,100,000 16,000,000    
Common stock issued (in shares) 6,704,852                        
Common stock, shares authorized (in shares)         75,000,000   75,000,000     75,000,000 290,000,000    
Proceeds from sale of common stock, net | $         $ 18,179,000 $ 24,930,000              
Each unit consist of number of warrant 3,352,306                        
Warrant exercise price (in dollars per share) | $ / shares                 $ 3.06        
Securities Purchase Agreement [Member]                          
Common Stock [Abstract]                          
Common stock issued, value | $       $ 25,000,000                  
Number of closings | Closing       2                  
Securities Purchase Agreement [Member] | Initial Closing [Member]                          
Common Stock [Abstract]                          
Proceeds from private placement of stock | $     $ 17,400,000                    
Securities Purchase Agreement [Member] | Second Closing [Member]                          
Common Stock [Abstract]                          
Proceeds from private placement of stock | $   $ 2,100,000                      
Common stock issued (in shares)   500,000                      
Common stock, shares authorized (in shares)   1,000,000                      
Common Stock [Member] | Securities Purchase Agreement [Member]                          
Common Stock [Abstract]                          
Number of shares callable by warrants (in shares)       1                  
Number of shares callable by each warrant (in shares)       1                  
Warrants [Member] | Securities Purchase Agreement [Member]                          
Common Stock [Abstract]                          
Number of shares callable by warrants (in shares)       1                  
ATM [Member]                          
Common Stock [Abstract]                          
Common stock issued (in shares)         766,382                
Proceeds from sale of common stock, net | $         $ 2,700,000                
Series A Preferred Stock [Member]                          
Preferred Stock [Abstract]                          
Preferred stock, shares authorized (in shares)         5,000,000   5,000,000            
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.001   $ 0.001            
Preferred stock, shares issued (in shares)         13,500   13,500            
Convertible preferred stock         3.60%   3.60% 3.60%          
Series A Preferred Stock [Member] | Dividend Paid [Member]                          
Preferred Stock [Abstract]                          
Dividends payable | $                         $ 700,000
Series A Preferred Stock [Member] | Dividend Declared [Member]                          
Preferred Stock [Abstract]                          
Dividends payable | $               $ 80,000          
Common Stock [Member]                          
Common Stock [Abstract]                          
Number of shares callable by warrants (in shares)         1                
Common stock issued (in shares)         6,704,852                
Common Stock Subscription Price | $ / shares         $ 2.55                
Each unit consist of number of common stock         1                
Each unit consist of number of warrant         0.5                
Warrant exercise price (in dollars per share) | $ / shares         $ 3.06                
Period exercisable from the date of issuance         30 months                
Gross proceeds from private placement of stock | $         $ 15,300,000                
Redemption price of warrant prior to expiration | $ / shares         $ 0.01                
Common stock price per share for warrant redemption | $ / shares         $ 7.65                
Number of consecutive trading days for warrant redemption         10 days                
Common Stock [Member] | 2015 Amendment [Member]                          
Common Stock [Abstract]                          
Number of shares callable by each warrant (in shares)                       0.75  
Common Stock [Member] | 2014 Amendment [Member]                          
Common Stock [Abstract]                          
Number of shares callable by each warrant (in shares)                       0.69