Warrants (Tables)

12 Months Ended

Dec. 31, 2013

Warrants (Tables) [Line Items]

Schedule of Share Based Compensation Warrants Activity [Table Text Block]

	Shares	Weighted Average Exercise Price	Range of Exercise Prices
Outstanding at December 31, 2011	929,914	$15.13	$2.80 - $169.47
Warrants issued	50,000	$2.26	$2.09 - $3.80
Warrants expired	(56,824)	$123.37	$75.00– $169.47
Outstanding at December 31, 2012	923,090	$7.77	$2.09 – $48.90
Warrants issued	993,600	$1.25	$1.25
Warrants cancelled	(128,333)	$7.92	$7.92
Warrants expired	(648,822)	$8.40	$7.92 - $48.90
Outstanding at December 31, 2013	1,139,535	$1.68	$1.25 - $10.40
Warrants exercisable at December 31, 2013	1,119,535	$1.67	$1.25 - $10.40

Schedule of Share Based Payment Award Warrants Valuation Assumptions [Table Text Block]

	December 31,
	2013	2012
CDTi stock price	$ 1.16	$ 2.11
Strike price	$ 1.25	$ 2.26
Expected volatility	80.5%	91.6%
Risk-free interest rate	1.6%	0.9%
Dividend yield	─	─
Expected life in years	5.0	6.0

Schedule of Reconciliation of Warrants Liability [Table Text Block]

	Year Ended December 31,
	2013	2012
Balance at beginning of period	$ 10	$ 100
Issuance of common stock warrants	749	─
Re-measurement of common stock warrants	180	(90)
Balance at end of period	$ 939	$ 10

Monte Carlo Simulation Model [Member]

Warrants (Tables) [Line Items]

Schedule of Share Based Payment Award Warrants Valuation Assumptions [Table Text Block]

	December 31, 2013	December 31, 2012
CDTi stock price	$ 1.51	$ 2.17
Strike price	$ 1.25	$ 7.92
Expected volatility	73.6%	71.3%
Risk-free interest rate	1.8%	0.3%
Dividend yield	─	─
Expected life in years	4.51	0.8