Warrants (Details 1) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance as of December 31, 2014	$ 499
Balance as of June 30, 2015	2,806
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance as of December 31, 2014	499
Balance as of June 30, 2015	2,806
Warrant [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance as of December 31, 2014	499
Issuance of warrants with derivative liabilities	2,958
Decrease in fair value of warrants	(651)
Balance as of June 30, 2015	$ 2,806