ACQUISITION AND RELATED PARTY ITEMS - Fair Values of Assets and Liabilties at Scil Acquisition Date (Details) - USD ($) $ in Thousands	Apr. 01, 2020	Jun. 30, 2020	Dec. 31, 2019
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Goodwill		$ 84,741	$ 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	$ 111,564
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Cash and cash equivalents	5,837
Accounts receivable	11,087
Inventories	11,373
Prepaid expenses	1,391
Other current assets	281
Property and equipment	19,023
Operating lease right-of-use assets	869
Other intangible assets	44,119
Deferred tax asset	1,013
Investments in unconsolidated affiliates	55
Other non-current assets	1,373
Total assets acquired	96,421
Accounts payable	8,721
Accrued liabilities	6,270
Operating lease liabilities, current	353
Current portion of deferred revenue, and other	2,669
Deferred revenue, non-current	132
Operating lease liabilities, non-current	524
Deferred tax liability	14,044
Other liabilities	274
Net assets acquired	63,434
Goodwill	48,130
Total fair value of consideration transferred	$ 111,564