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FAIR VALUE MEASUREMENTS (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Short-term Investments | $ 66,218,000 | $ 0
Nonrecurring [Member] |  |
Assets |  |
Licensed technology (net) | 43,042,000 | 3,977,000
Goodwill | 32,466,000 | 32,466,000
Nonrecurring [Member] | Licensed technology [Member] |  |
Assets |  |
Licensed technology (net) | 0 | 127,000
Nonrecurring [Member] | Licensed technology [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Licensed technology (net) | 0 | 0
Nonrecurring [Member] | Licensed technology [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Licensed technology (net) | 0 | 0
Nonrecurring [Member] | Licensed technology [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Licensed technology (net) | 43,042,000 | 3,977,000
Nonrecurring [Member] | Goodwill [Member] |  |
Assets |  |
Goodwill | 0 | 0
Nonrecurring [Member] | Goodwill [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Goodwill | 0 | 0
Nonrecurring [Member] | Goodwill [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Goodwill | 0 | 0
Nonrecurring [Member] | Goodwill [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Goodwill | 32,466,000 | $ 32,466,000
Recurring Member |  |
Assets |  |
Short-term Investments | 66,218,000 |
Recurring Member | Available-for-sale Securities [Member] |  |
Assets |  |
Short-term Investments | 0 |
Recurring Member | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Short-term Investments | 0 |
Recurring Member | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets |  |
Short-term Investments | 66,218,000 |
Recurring Member | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Short-term Investments | $ 0 |

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