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Debt - 8% Subordinated Convertible Shareholder Notes Due 2016 (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 27, 2012
Feb. 16, 2012
Apr. 11, 2011
Apr. 08, 2011
Dec. 31, 2015
Oct. 07, 2015
Dec. 31, 2014
Nov. 11, 2014
Dec. 31, 2013
May. 06, 2011
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    
Convertible Subordinated Debt | 8% Subordinated Convertible Shareholder Notes Due 2018                    
Debt Instrument [Line Items]                    
Face amount of debt                   $ 3.0
Interest rate (as a percent)                   8.00%
Maturity period     5 years              
Maturity acceleration notice period to be served by lender     30 days              
Conversion price (as a percent)         100.00%          
Conversion price (in dollars per share) $ 4.00     $ 7.044            
Threshold percentage of stock price trigger       120.00%            
Debt conversion, shares issued 250,000     369,853            
Convertible threshold notice period 75 days                  
Gains (losses) from modification $ 0.0                  
Minimum period, notice to warrant holder market value exceeds exercise price   30 days                
Minimum price market value exceeds exercise price (as a percent)   130.00%                
Notice period market value exceeds exercise price   10 days                
Cash consideration for issuance of warrants   $ 0.0                
Convertible Subordinated Debt | 8% Subordinated Convertible Shareholder Notes Due 2018 | Warrants Issued February 16, 2012                    
Debt Instrument [Line Items]                    
Number of shares into which warrants may be converted (in shares)   5,000                
Exercise price (in dollars per share)   $ 3.80