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MAJOR CUSTOMERS, PARTNERSHIPS AND STRATEGIC ALLIANCES - California Institute for Regenerative Medicine (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2021 | May 31, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Revenues |  |  | $ 110,701 | $ 118,192 | $ 102,428
Other non-current liabilities |  |  | 1,217 | 7,011 |
California Institute for Regenerative Medicine ("CIRM") |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Funds due under the agreement |  | $ 8,000 |  |  |
Other non-current liabilities |  |  | $ 0 | 6,400 |
Accrued interest |  |  |  | 1,200 |
California Institute for Regenerative Medicine ("CIRM") | Research grants |  |  |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |  |  |
Revenues | $ 5,200 |  |  | $ 5,200 |
Accrued interest | $ 1,200 |  |  |  |

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