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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities:    
Net loss   $ (106)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization $ 6 1
Unrealized loss (gain) on sale of marketable equity securities 441 (128)
Employee stock option expense  
Unrealized (gain) on derivative instruments (172)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 32 32
Accounts payable and other current liabilities 24 (12)
Net cash used in operating activities (491) (385)
Investing activities:    
Sale of short-term investments, net 408 246
Purchase of other assets (8)
Proceeds from the sale of marketable equity securities 259
Purchase of marketable equity securities (167)
Sale of derivative instruments 25
Net cash provided by investing activities 400 363
Financing activities:    
Purchase of common stock for cancellation (26) (6)
Net cash used in financing activities (26) (6)
Net decrease in cash and cash equivalents (117) (28)
Cash and cash equivalents, beginning of period 214 119
Cash and cash equivalents, end of period $ 97 $ 91