Derivative Liabilities (Details 1) - Warrant [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Balance, beginning of the year	$ 3,390	$ 441
GQM LLC Warrants (Note 13(v))	0	3,314
Change in fair value	150	(365)
Balance, end of the year	$ 3,540	$ 3,390

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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