Warrants - Issued July 3, 2013 Monte Carlo (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Nov. 23, 2015	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
November 23, 2015 Offering
Fair value assumptions and methodology for assets and liabilities
CDTi stock price (in dollars per share)			$ 1.22
Warrants Issued July 3, 2013, Liability
Fair value assumptions and methodology for assets and liabilities
Number of warrants (in shares)	65,000	159,000
CDTi stock price (in dollars per share)	$ 0.94	$ 1.81
Strike price (in dollars per share)	$ 1.25	$ 1.25
Expected volatility	99.10%	103.60%
Risk-free interest rate	1.20%	1.20%
Expected life in years	2 years 6 months	3 years 6 months
Warrants Issued July 3, 2013, Liability | November 23, 2015 Offering
Fair value assumptions and methodology for assets and liabilities
Number of warrants (in shares)	94,000
CDTi stock price (in dollars per share)	$ 0.94
Strike price (in dollars per share)	$ 1.22
Expected volatility	95.50%
Risk-free interest rate	1.50%
Expected life in years	3 years 10 months 24 days