DEFERRED GRANT INCOME (Details) - USD ($) $ in Thousands |
6 Months Ended | 12 Months Ended | |
|---|---|---|---|
Jun. 30, 2019 |
Dec. 31, 2018 |
Jul. 31, 2017 |
|
| Grants Receivable | $ 15,912 | ||
| California Institute Of Regenerative Medicine [Member] | |||
| Proceeds from Grantors | $ 12,550 | $ 9,050 | |
| Research and Development Arrangement, Contract to Perform for Others, Compensation Earned | $ 3,290 | $ 6,267 |