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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net loss $ (1,617) $ (379)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 12 2
Unrealized loss (gain) on sale of marketable equity securities 663 (461)
Accrued interest income (13)
Employee stock option expense 442
Unrealized (gain) on derivative instruments (285)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 48 (36)
Accounts payable and other current liabilities 12 119
Net cash used in operating activities (440) (1,053)
Investing activities:    
Sale of short-term investments, net 509 2,496
Loan to Zazu (1,500)
Purchase of other assets (8)
Proceeds from the sale of marketable equity securities 259
Purchase of marketable equity securities (167)
Sale of derivative instruments 43
Net cash provided by investing activities 501 1,131
Financing activities:    
Purchase of common stock for cancellation (65) (28)
Net cash used in financing activities (65) (28)
Net (decrease) increase in cash and cash equivalents (4) 50
Cash and cash equivalents, beginning of period 214 119
Cash and cash equivalents, end of period $ 210 $ 169