Warrants - Issued November 27, 2015 Black Scholes (Details) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair value assumptions and methodology for assets and liabilities
Number of warrants (in shares)	563,998	913,441
Warrants Issued November 27, 2015, Liability
Fair value assumptions and methodology for assets and liabilities
Number of warrants (in shares)	154,199	154,199
CDTi stock price (in dollars per share)	$ 1.65	$ 4.70
Strike price (in dollars per share)	$ 8.50	$ 8.50
Expected volatility	96.50%	96.60%
Risk-free interest rate	1.00%	1.80%
Expected life in years	5 years	5 years 6 months