Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Opening balance		$ (144)
Proceeds from issuance of Series B Shares			$ 2,225
Accretion of Series B Shares to redemption value	[1]		$ 1,968
Closing balance		(752)
Redeemable Convertible Preferred Stock Series B [Member]
Opening balance		87
Proceeds from issuance of Series B Shares		2,225
Accretion of Series B Shares to redemption value		1,968
Partial exercise of Redeemable Convertible Series B Preferred Stock written call option on the second date		677
Dividend on Redeemable Convertible Series B Preferred Stock		79
Closing balance		$ 5,036

[1] Based on the rights and privileges of Redeemable Convertible Series B Preferred Stock, since the Company did not obtain shareholder approval at March 31, 2018, the then outstanding Redeemable Convertible Series B Preferred Stock became redeemable at the option of OFI. Consequently, in each reporting period commencing March 31, 2018, the outstanding Redeemable Convertible Series B Preferred Stock is recorded at its maximum redemption value until occurrence of redemption or conversion. These shares were cancelled as a result of the entry into the Remediation Agreement on September 24, 2018.