ACQUISITION AND RELATED PARTY ITEMS - Unaudited Pro Forma Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Scil Animal Care Company
Business Acquisition [Line Items]
Revenue, net	$ 16,600	$ 47,276	$ 94,917	$ 95,026
Net (loss) income before equity in losses of unconsolidated affiliates		(400)	(12,512)	(955)
Net (loss) income attributable to Heska Corporation	600	(480)	(12,461)	(1,172)
CVM
Business Acquisition [Line Items]
Revenue, net	1,700	29,931	3,100	61,552
Net (loss) income before equity in losses of unconsolidated affiliates		(198)		626
Net (loss) income attributable to Heska Corporation	$ 100	$ (278)	$ 100	$ 409