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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Nov. 28, 2016
OPERATING ACTIVITIES      
Net loss $ (7,589) $ (9,663)  
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation 21 10  
Interest and amortization of discount on convertible notes 237 333  
Share-based transaction costs incurred in reverse recapitalization 7,258  
Financing loss on debt extinguishment 2,364  
Changes in fair value of derivative warrant liability (285) (262)  
Share-based compensation expense 479 676  
Changes in assets and liabilities:      
Other receivables (14) 538  
Other payables and accrued liabilities (69) 324  
Net cash used in operating activities (4,856) (786)  
INVESTMENT ACTIVITIES      
Increase in restricted cash (27)  
Purchase of property and equipment (58) (25)  
Net cash used in investing activities (85) (25)  
FINANCING ACTIVITIES      
Acquisition of a subsidiary in connection with reverse recapitalization 269  
Transaction costs incurred in reverse recapitalization (347)  
Inflows in connection with current assets and liabilities acquired in reverse recapitalization, net 317 2,002  
Exercise of warrants issued upon conversion of notes 409  
Issuance of common stock, net of issuance costs 12,702  
Issuance of convertible notes 750  
Net cash provided by financing activities 13,019 3,083  
Increase in cash and cash equivalents 8,078 2,272  
Cash and cash equivalents at the beginning of the year 2,709 437  
Cash and cash equivalents at the end of the year 10,787 2,709  
Non-cash financing transactions:      
Cashless exercise of warrants [1]  
Conversion of preferred A shares into common shares 90  
Extinguishment of convertible notes in exchange for preferred A shares $ 2,083 [1]  
Assets acquired (liabilities assumed):      
Current assets excluding cash and cash equivalents     $ (3,618)
Current liabilities     811
Derivative warrant liability     575
Convertible note     2,029
Reverse recapitalization effect on equity     472
Cash acquired in connection with reverse recapitalization     $ 269
[1] Less than 1