ACQUISITION AND RELATED PARTY ITEMS - Fair Values of Assets and Liabilties at Scil Acquisition Date (Details) - USD ($) $ in Thousands	Apr. 01, 2020	Sep. 30, 2020	Dec. 31, 2019
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Goodwill		$ 85,302	$ 36,204
Scil Animal Care Company
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination [Abstract]
Total fair value of consideration transferred	$ 109,753
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Cash and cash equivalents	5,889
Accounts receivable	10,707
Inventories	11,349
Net investment in leases, current	311
Prepaid expenses	1,404
Other current assets	405
Property and equipment	19,320
Operating lease right-of-use assets	877
Other intangible assets	44,517
Net investment in leases, non-current	1,027
Investments in unconsolidated affiliates	55
Other non-current assets	291
Total assets acquired	96,152
Accounts payable	8,221
Accrued liabilities	6,355
Operating lease liabilities, current	356
Current portion of deferred revenue, and other	3,220
Deferred revenue, non-current	94
Operating lease liabilities, non-current	529
Deferred tax liability	13,147
Other liabilities	276
Net assets acquired	63,954
Goodwill	45,799
Total fair value of consideration transferred	$ 109,753