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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Cash flows from operating activities:      
Net loss for the period $ (2,652) $ (948)  
Adjustments to reconcile net loss for the period to net cash used in operations:      
Depreciation and amortization 12 228  
Stock-based compensation 51 338  
(Gain)/loss on other investments 624 (2,028)  
Change in working capital account items:      
Other current assets 70 169  
Accounts payable, accrued liabilities and other 137 (962)  
Net cash used in operating activities (1,758) (3,203)  
Cash flows from investing activities:      
Disposition of short-term investments, net of acquisitions 985 2,226  
Additions to plant and equipment (40)    
Proceeds from option/sale agreements, net 100    
Net cash provided by investing activities 1,045 2,226  
Cash flows from financing activities:      
Payment of taxes from withheld shares (46) (39)  
Proceeds from exercise of stock options 66    
Net cash provided by / (used in) financing activities 20 (39)  
Net decrease in cash and cash equivalents (693) (1,016)  
Cash and cash equivalents, beginning of period 1,071 1,431 $ 1,431
Cash and cash equivalents, end of period $ 378 $ 415 $ 1,071