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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Nov. 28, 2016
OPERATING ACTIVITIES              
Net loss $ (1,893) $ (3,508) $ (3,362) $ (4,815) $ (7,589) $ (9,663)  
Adjustments to reconcile net loss to net cash used in operating activities:              
Depreciation 13 6 23 12 21 10  
Interest and revaluation of convertible notes, net 66 237      
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 2,364 2,364  
Changes in fair value of derivative warrant liability (1) (187) (14) (275) (285) (262)  
Shares issued as consideration-vendor 74 74      
Share-based compensation expense 406 154 822 154 479 676  
Changes in assets and liabilities:              
Other receivables (60) (165) (138) (268) (14) 538  
Other payables and accrued liabilities 112 (161) 52 396 (69) 324  
Net cash used in operating activities (1,349) (1,431) (2,543) (2,198) (4,856) (786)  
INVESTMENT ACTIVITIES              
Increase in restricted cash (27) (27) (27)  
Purchase of property and equipment (91) (6) (224) (28) (58) (25)  
Net cash used in investing activities (91) (33) (224) (55) (85) (25)  
FINANCING ACTIVITIES              
Acquisition of a subsidiary in connection with reverse recapitalization         269  
Transaction costs incurred in reverse recapitalization         (347)  
Outflow (inflow) in connection with current assets and liabilities acquired in reverse recapitalization, net 126 (82) 317 2,002  
Exercise of warrants issued upon conversion of notes         409  
Issuance of common stock, net of issuance costs 9,414 12,704 12,702  
Issuance of convertible notes         750  
Net cash provided by financing activities 9,540 12,622 13,019 3,083  
Net increase (decrease) in cash and cash equivalents and restricted cash (1,440) 8,076 (2,767) 10,369 8,078 2,272  
Cash and cash equivalents and restricted cash at the beginning of the period 9,487 5,002 10,814 2,709 2,709 437  
Cash and cash equivalents and restricted cash at the end of the period 8,047 13,078 8,047 13,078 10,814 2,709  
Non-cash financing transactions:              
Cashless exercise of warrants [1] [1]  
Conversion of preferred A shares into common shares $ 15 $ 2,083 $ 30 $ 2,083 90  
Extinguishment of convertible notes in exchange for preferred A shares         $ 2,083  
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