Short-term notes payable (Details) (Demand Notes [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Apr. 18, 2013	Dec. 13, 2013	Nov. 06, 2013	Sep. 27, 2013	Sep. 03, 2013	Nov. 01, 2013	Dec. 17, 2013
Short-term Debt [Line Items]
Note Amount	$ 1,150
Phoenix Banne Holding LLC [Member]
Short-term Debt [Line Items]
Note Amount		250
Michael W Engmann [Member]
Short-term Debt [Line Items]
Note Amount			150		250
Warrants			5,000	4,167
Kendu Partners Company [Member]
Short-term Debt [Line Items]
Note Amount						250
Warrants				4,167
Jag Multi Investments [Member]
Short-term Debt [Line Items]
Note Amount							125
Warrants							2,083
Philip Sassower [Member]
Short-term Debt [Line Items]
Note Amount								$ 125
Warrants								2,083