ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fair Value Measurements (Details) - USD ($) $ in Thousands |
Mar. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Liabilities subject to fair value measurement: | ||
| Contingent consideration | $ 1,500 | $ 1,921 |
| Employment agreement award | 27,598 | 27,017 |
| Total | 29,098 | 28,938 |
| Mezzanine equity subject to fair value measurement: | ||
| Redeemable noncontrolling interests | 10,292 | 10,564 |
| Fair Value, Inputs, Level 3 [Member] | ||
| Liabilities subject to fair value measurement: | ||
| Contingent consideration | 1,500 | 1,921 |
| Employment agreement award | 27,598 | 27,017 |
| Total | 29,098 | 28,938 |
| Mezzanine equity subject to fair value measurement: | ||
| Redeemable noncontrolling interests | $ 10,292 | $ 10,564 |