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Income Taxes (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 04, 2017
Apr. 01, 2015
Apr. 01, 2014
Mar. 31, 2014
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]                    
Income tax rate                 34.00% 34.00%
Revaluation of deferred tax assets and liabilities                 $ 17,300  
Accrued liabilities         $ 1,600   $ 1,600      
Income Tax Provision         $ 12 $ 221
Previous U.S. federal corporate tax rate             35.00%      
U.S. federal corporate tax rate             21.00%      
Minimum [Member]                    
Operating Loss Carryforwards [Line Items]                    
Income tax rate                 21.00%  
Maximum [Member]                    
Operating Loss Carryforwards [Line Items]                    
Income tax rate                 35.00%  
Federal Tax Authority [Member] | Internal Revenue Service (IRS) [Member]                    
Operating Loss Carryforwards [Line Items]                    
Operating loss carryforwards                 $ 12,500  
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]                    
Operating Loss Carryforwards [Line Items]                    
Standard corporate income tax rate   20.00% 21.00% 23.00%            
Description of standard corporate income tax rate                   The rate further reduced to 19% effective April 1, 2017.
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member] | Photo Therapeutics Limited [Member]                    
Operating Loss Carryforwards [Line Items]                    
Operating loss carryforwards                 $ 12,800  
Percentage of valuation allowance                 100.00%  
Foreign Tax Authority [Member] | Israel Tax Authority [Member]                    
Operating Loss Carryforwards [Line Items]                    
Standard corporate income tax rate 25.00%                  
Reduction in standard corporate income tax rate 1.50%                  
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Minimum [Member]                    
Operating Loss Carryforwards [Line Items]                    
Standard corporate income tax rate                   25.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Maximum [Member]                    
Operating Loss Carryforwards [Line Items]                    
Standard corporate income tax rate                   26.50%
Federal Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | Minimum [Member]                    
Operating Loss Carryforwards [Line Items]                    
Expiration year                 2022  
Federal Jurisdiction [Member] | Internal Revenue Service (IRS) [Member] | Maximum [Member]                    
Operating Loss Carryforwards [Line Items]                    
Expiration year                 2037