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