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OPERATING COSTS BY NATURE - General and Administrative Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]    
Salaries and benefits $ 12,157 $ 9,029
Share-based compensation 13,371 4,225
Consulting and professional fees 3,036 2,288
Travel expense 1,044 562
Rent expense 842 703
Insurance expense 676 569
Computer expenses 668 789
Depreciation and amortization 194 202
Shareholder and investor relations 99 323
Listing and filing fees 249 251
Directors fees and expenses 347 227
Other expenses 258 1,139
General and administrative expense $ 32,941 $ 20,307