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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net loss $ (528) $ (607)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 5 6
Amortization of right of use lease asset 10 10
Unrealized loss of marketable equity securities 122 233
Employee stock option expense 28 85
Gain on sale of marketable equity securities (13) (25)
Loss on derivative instruments 3 25
Other income PPP loan forgiveness (10) 0
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 27 (21)
Accounts payable and other current liabilities (26) 56
Net cash used in operating activities (382) (238)
Investing activities:    
Sale of short-term investments, net 938 40
Cash from sale of marketable equity securities 78 76
Purchase (sale) of derivative instruments - net 0 (9)
Net cash provided by investing activities 1,016 107
Financing activities:    
Issuance of common stock 98 0
Stock options exercised 67 0
Purchase of common stock for cancellation 0 (3)
Net cash provided by (used in) financing activities 165 (3)
Net increase (decrease) in cash and cash equivalents 799 (134)
Cash and cash equivalents, beginning of period 605 574
Cash and cash equivalents, end of period $ 1,404 $ 440