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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 27, 2015
USD ($)
shares
May. 08, 2015
USD ($)
May. 31, 2015
USD ($)
Closing
shares
Mar. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
USD ($)
Dec. 17, 2015
shares
Mar. 31, 2015
USD ($)
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 securities callable by each unit (in shares)       16,000,000        
Common stock, shares authorized (in shares)       75,000,000 290,000,000      
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 Declared [Member]                
Preferred Stock [Abstract]                
Dividends payable | $           $ 80    
Series A Preferred Stock [Member] | Dividend Paid [Member]                
Preferred Stock [Abstract]                
Dividends payable | $               $ 700
2015 Amendment [Member] | Common Stock [Member]                
Common Stock [Abstract]                
Number of shares callable by each warrant (in shares)             0.75  
2014 Amendment [Member] | Common Stock [Member]                
Common Stock [Abstract]                
Number of shares callable by each warrant (in shares)             0.69  
Securities Purchase Agreement [Member]                
Common Stock [Abstract]                
Common stock issued, value | $     $ 25,000          
Number of closings | Closing     2          
Securities Purchase Agreement [Member] | Common Stock [Member]                
Common Stock [Abstract]                
Number of securities callable by each unit (in shares)     1          
Number of shares callable by each warrant (in shares)     1          
Securities Purchase Agreement [Member] | Warrants [Member]                
Common Stock [Abstract]                
Number of securities callable by each unit (in shares)     1          
Securities Purchase Agreement [Member] | Initial Closing [Member]                
Common Stock [Abstract]                
Proceeds from private placement of stock | $   $ 17,400            
Securities Purchase Agreement [Member] | Second Closing [Member]                
Common Stock [Abstract]                
Proceeds from private placement of stock | $ $ 2,100              
Common stock issued (in shares) 500,000              
Common stock, shares authorized (in shares) 1,000,000