ACQUISITION AND RELATED PARTY ITEMS - Additional Information (Details)			1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 01, 2020 USD ($)	Dec. 05, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 36,204,000	$ 84,741,000		$ 84,741,000
Goodwill, period increase (decrease)						110,000
Related party loan			0	1,134,000		1,134,000
Operating cash outflows - operating leases						1,011,000	$ 889,000
Operating lease right-of-use assets			5,726,000	5,988,000		5,988,000
Total lease liabilities				$ 6,449,000		$ 6,449,000
International
Business Acquisition [Line Items]
Goodwill	$ 39,200,000
North America
Business Acquisition [Line Items]
Goodwill	$ 8,900,000
CVM Practice | Affiliated Entity
Business Acquisition [Line Items]
Number of warehouses | segment				2		2
Number of loans | segment				2		2
Operating cash outflows - operating leases						$ 15,000	0
Operating lease right-of-use assets			0	$ 169,000		169,000
Total lease liabilities			0	169,000		169,000
Accounts payable, related parties			0	1,000,000.0		1,000,000.0
Cuattro, LLC | Heska Imaging | Affiliated Entity
Business Acquisition [Line Items]
Related party - amount of transaction						0	6,000
Heska Imaging | Affiliated Entity
Business Acquisition [Line Items]
Related party loan			0	0		0
Scil Animal Care Company
Business Acquisition [Line Items]
Percentage of voting interest acquired	100.00%
Cash consideration transferred	$ 111,000,000
Purchase price	111,564,000
Goodwill	$ 48,130,000
Acquisition related costs				2,500,000		5,000,000.0
Revenue, net				16,600,000	$ 47,276,000	94,917,000	95,026,000
Net (loss) income attributable to Heska Corporation				600,000	(480,000)	(12,461,000)	(1,172,000)
CVM
Business Acquisition [Line Items]
Percentage of voting interest acquired		100.00%
Purchase price		$ 14,400,000
Goodwill		8,959,000
Equity interest issued and issuable		$ 8,900,000
Acquisition related costs				100,000		200,000
Revenue of acquiree since acquisition date			800,000
Net income of acquiree since acquisition date			$ 100,000
Revenue, net				1,700,000	29,931,000	3,100,000	61,552,000
Net (loss) income attributable to Heska Corporation				$ 100,000	$ (278,000)	$ 100,000	$ 409,000