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SIGNIFICANT ACCOUNTING POLICIES, RECENT ACCOUNTING PRONOUNCEMENTS, ASU 2016-09 (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New accounting pronouncements
Cash and cash equivalents		$ 16,660	$ 12,910
Restricted cash included in current assets		4	361
Restricted cash included in other non-current assets		110
Total cash, cash equivalents and restricted cash shown in the statement of cash flows		$ 16,774	$ 13,271	$ 21,825
ASU No. 2016-02 \| Restatement Adjustment
New accounting pronouncements
Operating lease assets	$ 1,500
Operating lease liabilities	$ 1,500