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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities:    
Net loss $ (13) $ (489)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized (gain) loss on derivative instruments (172) 1
Depreciation and amortization 1 1
Deferred income tax expense (benefit) (62)
Gain on sale of marketable equity securities (221)
Accrued interest income (8)
Gain on warrant liability (3)
Employee stock option expense 2
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 32 18
Accounts payable and other current liabilities (12) (92)
Net cash used in operating activities (385) (632)
Investing activities:    
Sale (purchase) of short-term investments, net 246 (16,007)
Proceeds from the sale of marketable equity securities 259
Purchase of marketable equity securities (167)
Sale of derivative instruments 25 40
Net cash provided by (used in) investing activities 363 (15,967)
Financing activities:    
Purchase of common stock for cancellation (6) (83)
Net cash used in financing activities (6) (83)
Net decrease in cash and cash equivalents (28) (16,682)
Cash and cash equivalents, beginning of period 119 17,718
Cash and cash equivalents, end of period $ 91 $ 1,036