Warrants - Issued November 27, 2015 Black Scholes (Details) - $ / shares			12 Months Ended
	Nov. 27, 2015	Nov. 04, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair value assumptions and methodology for assets and liabilities
Number of warrants (in shares)			4,567,207	1,610,069	1,139,535
Series A Warrants
Fair value assumptions and methodology for assets and liabilities
Number of warrants (in shares)	771,000	388,393	771,000
CDTi stock price (in dollars per share)	$ 1.39	$ 3.04	$ 0.94
Strike price (in dollars per share)	$ 1.70	$ 3.25	$ 1.70
Expected volatility	110.30%	87.10%	96.60%
Risk-free interest rate	1.70%	1.60%	1.80%
Expected life in years	5 years 7 months 6 days	5 years	5 years 6 months
Series B Warrants
Fair value assumptions and methodology for assets and liabilities
Number of warrants (in shares)	1,686,138	168,571	1,686,138
CDTi stock price (in dollars per share)	$ 1.39	$ 3.04	$ 0.94
Strike price (in dollars per share)	$ 0.01	$ 0.01	$ 0.01