Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Opening balance		$ 4,390
Recognition of written call Option as a discount of Series B Shares			$ 1,500
Partial exercise of Series B Shares written call option
Revaluation of option to purchase Series B Shares		(3,288)	3,018
Extinguishment of option to purchase Series B Shares	[1]	(421)
Closing balance			$ 4,390

[1] On September 24, 2018, the OFI Purchase Agreement was superseded by the Remediation Agreement entered into with OFI and Note Holders. Consequently, the option to purchase Series B Shares has been extinguished, as described below in more details.