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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net loss $ (3,894) $ (8,610)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 9 6
Amortization of warrant issuance costs 0 (30)
Stock-based compensation 833 1,234
Changes in assets and liabilities:    
Prepaid expenses and other current assets (185) (108)
Accounts payable and accrued liabilities (1,155) 1,643
Accrued payroll and related expenses (1,372) (1,383)
Related party payable 0 (11)
Income tax liability 5 0
Deferred revenue (375) (375)
Net cash used in operating activities (6,134) (7,634)
Cash flows from investing activities:    
Purchase of property and equipment 0 (2)
Purchase of investments 0 (2,752)
Proceeds from sale or maturity of investments 3,116 4,116
Net cash provided by investing activities 3,116 1,362
Cash flows from financing activities:    
Proceeds from exercise of options 0 20
Proceeds from sale of common stock 0 6,795
Net cash provided by financing activities 0 6,815
Net increase (decrease) in cash and cash equivalents (3,018) 543
Cash and cash equivalents, beginning of period 6,627 8,726
Cash and cash equivalents, end of period 3,609 9,269
Cash paid for income taxes $ 0 $ 0