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CONTRACTS WITH CUSTOMERS AND REVENUE CONCENTRATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |  |  |
Allowance for doubtful accounts | $ 1,116 | $ 1,116 | $ 1,467
Receivables from contracts with customers, net of allowance for doubtful accounts | 12,776 | 12,776 | 14,291
Deferred sales commission | 4,246 | 4,246 | $ 3,675
Amortization of deferred sales commissions | 471 | 816 |
Deferred revenue | 3,328 | 8,188 |
Expected remaining performance obligation revenue | $ 47,279 | $ 47,279 |
Expected remaining performance obligation revenue in percentage | 63.00% | 63.00% |
Expected timing of satisfaction period | 12 months | 12 months |

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