Schedule of proceeds of equity components based on fair value (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Gross proceeds of units	$ 3,200
Transaction costs of units	328
Net proceeds of units	2,872
Common stock [Member]
Gross proceeds of units	1,627
Transaction costs of units	167
Net proceeds of units	1,460
Warrants [Member]
Gross proceeds of units	487
Transaction costs of units	50
Net proceeds of units	$ 437