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Share-Based Compensation Plans - Valuation Assumptions (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Stock Options:    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average expected volatility 101.00% 92.00%
Weighted Average Term (in years) 10 years 10 years
Risk-free interest rate 2.00% 2.00%
Weighted average forfeiture rate 55.00% 0.00%
Weighted average fair value at date of grant (in dollars per share) $ 0.59 $ 1.08
Warrants:    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average expected volatility 69.00%
Weighted Average Term (in years) 2 years
Risk-free interest rate 2.00%
Weighted average fair value at date of grant (in dollars per share) $ 1.24