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CONVERTIBLE SENIOR NOTES - Embedded Derivatives (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Embedded derivatives      
Embedded derivatives      
Share price (in dollars per share) $ 0.25 $ 0.20 $ 0.64
Risk-Free Interest Rate (as a percent) 1.47% 1.54% 1.75%
Estimated Stock Volatility (as a percent) 40.00% 40.00% 40.00%
Default Intensity (as a percent) 2.00% 2.00% 2.00%
Recovery Rate (as a percent) 30.00% 30.00% 30.00%
Mandatory Redemption, Probability of Event (as a percent) 80.00%    
Conversion Option, Probability of Event (as a percent) 10.00%    
Note Reaches Maturity, Probability of Event (as a percent) 10.00%    
Convertible Senior Notes.      
Embedded derivatives      
Carrying value of Notes $ 5.5 $ 5.3  
Unamortized debt discount 0.4 0.6  
Fair value of notes payable 7.1 7.5  
Convertible Senior Notes. | Embedded derivatives      
Embedded derivatives      
Fair value of embedded derivatives 0.1 0.2  
Net gain on changes in fair value of embedded derivatives 0.1    
Non-convertible Promissory Note      
Embedded derivatives      
Carrying value of Notes 1.3 1.3  
Fair value of notes payable $ 1.0 $ 1.1