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Debt - 3.0 million 8% Shareholder Note Due 2016 (Details) - USD ($)
$ / shares in Units, $ in Millions
Jul. 27, 2012
Dec. 31, 2015
Oct. 07, 2015
Dec. 31, 2014
Nov. 11, 2014
Dec. 31, 2013
Maximum            
Debt Instrument [Line Items]            
Exercise price (in dollars per share)   $ 4.50   $ 10.40   $ 10.40
Warrants Issued November 11, 2014, Liability            
Debt Instrument [Line Items]            
Number of shares into which warrants may be converted (in shares)     75,000   80,000  
Exercise price (in dollars per share)     $ 1.75 $ 1.75 $ 1.75  
Notes Payable, Other Payables | 3.0 million 8% shareholder note due 2018            
Debt Instrument [Line Items]            
Face amount of debt $ 3.0 $ 3.0   $ 3.0    
Interest rate (as a percent) 8.00% 8.00%   8.00%    
Cash consideration for issuance of warrants $ 0.0          
Notes Payable, Other Payables | Warrants Issued July 27, 2012 | 3.0 million 8% shareholder note due 2018            
Debt Instrument [Line Items]            
Number of shares into which warrants may be converted (in shares) 45,000          
Exercise price (in dollars per share) $ 2.09          
Exercisable at issuance (as a percent) 33.00%          
Exercisable first year (as a percent) 33.00%          
Exercisable second year (as a percent) 33.00%