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Warrants - Issued June 8, 2015 Black Scholes (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair value assumptions and methodology for assets and liabilities    
Number of warrants (in shares) 3,613,615 4,567,207
Warrants Issued June 8, 2015, Liability    
Fair value assumptions and methodology for assets and liabilities    
Number of warrants (in shares) 180,000 180,000
CDTi stock price (in dollars per share) $ 0.72 $ 0.94
Strike price (in dollars per share) $ 2.65 $ 2.65
Expected volatility 96.20% 102.30%
Risk-free interest rate 1.20% 1.70%
Expected life in years 4 years 8 months 12 days 4 years 10 months 24 days
November 23, 2015 Offering | Warrants Issued June 8, 2015, Liability    
Fair value assumptions and methodology for assets and liabilities    
Number of warrants (in shares) 320,000 320,000
CDTi stock price (in dollars per share) $ 0.72 $ 0.94
Strike price (in dollars per share) $ 1.70 $ 1.70
Expected volatility 102.00% 110.30%
Risk-free interest rate 1.30% 1.80%
Expected life in years 5 years 3 months 18 days 5 years 6 months