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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 13, 2018 | Mar. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Trading gains |  |  |  |  | $ (241) |  | $ 166 |  | $ 397 |
Allowance for doubtful accounts receivable |  |  |  |  | 3,016 |  | 3,512 |  |  |
Intangible asset impairment loss |  |  |  |  | 13,862 |  |  |  |  |
Goodwill |  | $ 59,402 |  |  | 50,086 | [1] | 62,896 | [1] | 3,777 |
Goodwill, fair value |  |  |  |  |  |  |  |  |  | $ 58,600
Severance expenses |  |  |  |  | 1,557 |  | 1,461 |  | 1,309 |
Advertising expenses |  |  |  |  | 9,500 |  | 8,100 |  | 8,500 |
Intangible assets fair value |  |  |  |  | 38,600 |  |  |  |  |
Cumulative adjustment to retained earnings |  |  |  |  |  |  |  |  | 3,000 |
Operating lease right of use assets |  |  |  |  | 12,626 |  |  |  |  |
Rent expenses |  |  |  |  |  |  | 3,100 |  | 3,200 |
Goodwill impairment |  |  |  |  | 12,292 | [2] |  |  |  |
Telematics Services [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 43,383 | [1] | 55,069 | [1] | $ 1,732 |
Goodwill impairment |  |  |  |  | 11,088 | [2] |  |  |  |
Telematics Products [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment | [2] |  |  |  | $ 1,204 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage, equity method |  |  |  |  | 50.00% |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage, equity method |  |  |  |  | 20.00% |  |  |  |  |
Road Track [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Bussiness acquisition percentage |  | 81.30% |  |  |  |  |  |  |  |
Amount paid to shareholders |  | $ 91,700 |  |  |  |  |  |  |  |
Purchase price |  | 113,000 |  |  |  |  |  |  |  |
Payment in cash |  | 75,700 |  |  |  |  |  |  |  |
Additional amount paid |  | 12,000 |  |  |  |  |  |  |  |
Remaining amount paid as bonus |  | 4,000 |  |  |  |  |  |  |  |
Shares issued during period |  |  | 373,489 | 373,489 |  |  |  |  |  |
Goodwill | [3] | $ 59,402 |  |  |  |  |  |  |  |
One reporting unit [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 58,600 |  |  |  |  |
One reporting unit [Member] | Telematics Services [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 1,800 |  |  |  |  |
One reporting unit [Member] | Telematics Products [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 2,000 |  |  |  |  |
Two different reporting [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 3,800 |  |  |  |  |
Two different reporting [Member] | Telematics Services [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 52,700 |  |  |  |  |
Two different reporting [Member] | Telematics Products [Member] |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 5,900 |  |  |  |  |
[1] | The accumulated amount of goodwill impairment loss as of December 31, 2019, and 2018 was US$ 19.4 million and US$ 7.1million, respectively.
[2] | As a result of the circumstances described in note 9 the company recorded a goodwill impairment in the total amount of US$ 12.3 million in connection with two reporting units (both units related to Road track operations, see Note 3). One reporting unit within the Telematics services and the other reporting unit within the Telematics product's segments. The impairment was based on valuation performed by the management using the assistance of a third party appraiser in accordance with the income approach. The significant assumptions used for the assessment were discount rate of 14.9% and a long-term growth rate of 0.5%.
[3] | As part of the purchase price allocation for the acquisition, the Company recorded goodwill in the amount of $59.4 million. Goodwill reflects the value or premium of the acquisition price in excess of the fair values assigned to specific tangible and intangible assets. Goodwill has an indefinite useful life and therefore is not amortized as an expense (the goodwill balance is not deductible for income tax purposes), but is reviewed annually (or more, in certain circumstances) for impairment of its fair value to the Company. The purchase price intrinsically recognizes the benefits of the broadened depth of new markets and management team and is primarily attributable to expected synergies.

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