ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair value measurements on recurring and nonrecurring valuation techniques (Details)
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3 Months Ended |
12 Months Ended |
Mar. 31, 2020 |
Dec. 31, 2019 |
| Contingent Consideration [Member] | Measurement Input, Price Volatility [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Fair Value Assumptions Measurement Rate |
20.80%
|
20.80%
|
| Contingent Consideration [Member] | Measurement Input, Discount Rate [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Fair Value Assumptions Measurement Rate |
14.50%
|
14.50%
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| Employment Agreement Award [Member] | Measurement Input, Discount Rate [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Fair Value Assumptions Measurement Rate |
10.00%
|
10.00%
|
| Employment Agreement Award [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Fair Value Assumptions Measurement Rate |
2.00%
|
2.00%
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| Redeemable Noncontrolling Interest [Member] | Measurement Input, Discount Rate [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Fair Value Assumptions Measurement Rate |
11.00%
|
11.00%
|
| Redeemable Noncontrolling Interest [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] |
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| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
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| Fair Value Assumptions Measurement Rate |
1.00%
|
1.00%
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