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BUSINESS COMBINATIONS - Preliminary purchase price (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Smithers Avanza Toxicology Services LLC acquisition |  |
Assets acquired and liabilities assumed: |  |
Receivables |  | $ 1,128
Property and equipment |  | 1,564
Prepaid expenses |  | 147
Goodwill |  | 545
Accrued expenses |  | (219)
Customer advances |  | (570)
Total |  | $ 2,595
PCRS acquisition |  |
Assets acquired and liabilities assumed: |  |
Receivables | $ 578 |
Property and equipment | 2,666 |
Unbilled revenues | 162 |
Prepaid expenses | 27 |
Goodwill | 3,002 |
Accounts payable | (109) |
Accrued expenses | (118) |
Customer advances | 351 |
Total | $ 5,857 |

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