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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Operating activities:        
Net loss $ (2,352) $ (502) $ (4,756) $ (1,646)
Adjustments to reconcile net loss to net cash used in operating activities:        
Unrealized loss/(gain) on derivative 183 (19) 340 (45)
Stock-based compensation - contractors 210 28 552 58
Stock-based compensation - employees 907 41 1,409 152
Changes in operating assets and liabilities:        
Prepaid assets (177) (23) (155) 35
Other current assets 4 3 1 (1)
Accounts payable 196 (110) 248 (62)
Accrued liabilities 71 38 40 (4)
Net cash used in operating activities (958) (544) (2,321) (1,513)
Financing activities:        
Options and warrants exercised 383 0 512 108
Private placement 31 0 7,571 5,000
Net cash provided by financing activities 414 0 8,083 5,108
Increase in cash and cash equivalents (544) (544) 5,762 3,595
Cash and cash equivalents - Beginning of period 10,232 5,081 3,926 942
Cash and cash equivalents - End of period $ 9,688 $ 4,537 $ 9,688 $ 4,537