ACQUISITION AND RELATED PARTY ITEMS - Intangible Assets Acquired, Amortization Method (Details) - USD ($) $ in Thousands	Apr. 01, 2020	Dec. 05, 2019	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Total intangible assets acquired			$ 64,229	$ 14,517
Scil Animal Care Company
Business Acquisition [Line Items]
Total intangible assets acquired	$ 44,517
Scil Animal Care Company | Trade names
Business Acquisition [Line Items]
Fair Value	$ 7,556
CVM
Business Acquisition [Line Items]
Total intangible assets acquired		$ 2,608
CVM | Developed technology
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired		$ 57
Customer Relationships | Scil Animal Care Company
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	10 years
Fair Value	$ 36,272
Customer Relationships | CVM
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		6 years
Fair Value		$ 2,440
Software Development | Scil Animal Care Company
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	7 years
Fair Value	$ 353
Backlog | Scil Animal Care Company
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	2 months 12 days
Fair Value	$ 210
Non-compete agreements | Scil Animal Care Company
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	2 years
Fair Value	$ 60
Trade names | Scil Animal Care Company
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life	9 months 18 days
Fair Value	$ 66
Trade names | CVM
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		4 years
Fair Value		$ 111