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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities:    
Net loss $ (3,099) $ (3,500)
Adjustments to reconcile net income/(loss) to net cash used in operations:    
Depreciation and amortization 11 12
Stock-based compensation 421 390
(Gain)/Loss on other investments 30 1,129
Change in working capital account items:    
Other current assets 120 146
Accounts payable, accrued liabilities and other (8) 80
Net cash used in operating activities (2,525) (1,743)
Cash flows from investing activities:    
Proceeds from sales of marketable securities   300
Disposition of short-term investments, net 400 2,299
Proceeds from option/sale agreements, net 1,100  
Net cash provided by investing activities 1,500 2,599
Cash flows from financing activities:    
Proceeds from equity financing, net 610  
Payment of taxes from withheld shares (194)  
Net cash provided by financing activities 416  
Net increase/(decrease) in cash and cash equivalents (609) 856
Cash and cash equivalents, beginning of period 7,762 1,408
Cash and cash equivalents, end of period $ 7,153 $ 2,264