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License and Supply Agreement, Net (Details Narrative) (10Q) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 23, 2012
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2013
Sep. 30, 2013
Long-term intangible asset   $ 2,250          
Other long-term assets   904   $ 938 $ 1,072    
Accumulated amortization   1,346   1,312 1,178    
Amortization of other deferred charges   34 $ 34 134 190    
Interest expense   10 13 24    
Royalty expense   47 $ 29 161 98    
Accrued Expenses [Member]              
Royalty expense   $ 47          
Accounts Payable [Member]              
Royalty expense       $ 50 $ 34    
Medica S.p.A. [Member]              
Expiration term of license agreement Dec. 31, 2025            
Debt instrument, interest rate, stated percentage           12.00% 12.00%
Medica [Member] | April 23, 2014 through December 31, 2025 [Member]              
Royalty rate   3.00%   3.00%