ACQUISITION AND RELATED PARTY ITEMS - Additional Information (Details) $ in Thousands						1 Months Ended	6 Months Ended	12 Months Ended
	Sep. 01, 2021 USD ($)	Jul. 01, 2021 USD ($)	Feb. 01, 2021 USD ($)	Apr. 01, 2020 USD ($)	Mar. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Feb. 21, 2021	Dec. 05, 2019 USD ($)
Business Acquisition [Line Items]
Goodwill						$ 36,204		$ 118,826	$ 88,276	$ 36,204
Acquired additions based on prior year tax positions								508	1,072
Unrecognized tax benefits						0		893	808	0
Cash paid for amounts included in the measurement of lease liabilities:								2,315	2,213	1,800
Operating lease right-of-use assets								5,198	5,457
Operating lease liability								$ 5,736
CVM Practice | Affiliated Entity
Business Acquisition [Line Items]
Number of warehouses | segment								2
Cash paid for amounts included in the measurement of lease liabilities:								$ 37	31
Operating lease right-of-use assets								200	200
Operating lease liability								200	200
Biotech Laboratories U.S.A. LLC
Business Acquisition [Line Items]
Percentage of voting interest acquired	65.00%
Purchase price in cash	$ 16,250
Ownership percentage	35000000.00%
Notes payable	$ 15,900
Goodwill	25,839
Acquisition related costs								400	0
Purchase price	32,150
Notes payable	$ 15,900
BiEsseA s.r.1.
Business Acquisition [Line Items]
Percentage of voting interest acquired											100.00%
Purchase price in cash		$ 4,835
Goodwill		4,562
Acquisition related costs								300	0
Purchase price		7,169
Acquired additions based on prior year tax positions								$ 500
Business Combination, Indemnification Assets, Basis for Amount								0.5 million
Business Acquisition, Goodwill, Expected Tax Deductible Amount		4,600
Business combination, contingent consideration, liability		2,800
Notes payable		$ 2,334						$ 2,300
Lacuna Diagnostics, Inc.
Business Acquisition [Line Items]
Percentage of voting interest acquired											100.00%
Purchase price in cash			$ 4,255
Goodwill			4,200
Acquisition related costs								100	0
Purchase price			5,955
Debt assumed in acquisition			1,700
Business combination, contingent consideration, liability			$ 2,000
Holdback release period			18 months
Initial earn out period			12 months
Business Combination, Indemnification Liabilities, Holdback Released			$ 100
Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Gain (Loss)								1,700
Business Combination, Indemnification Liabilities, Holdback			400					300
Business Combination, Contingent Consideration Arrangements, Liability Performance Reduction			1,000
Notes payable								0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Acquisition Date			$ 1,700
Scil Animal Care Company
Business Acquisition [Line Items]
Percentage of voting interest acquired				100.00%
Purchase price in cash				$ 110,300	$ 111,000
Goodwill				46,000
Acquisition related costs								0	6,300	700
Acquired additions based on prior year tax positions								1,100
Unrecognized tax benefits								400
Revenue of acquiree since acquisition date							$ 61,300
Earnings or loss of acquiree since acquisition date							$ 1,100
Revenue, net								215,874	201,700
Net loss attributable to Heska Corporation								(15,215)	(2,487)
Scil Animal Care Company | International Segment
Business Acquisition [Line Items]
Goodwill				37,300
Scil Animal Care Company | North America Segment
Business Acquisition [Line Items]
Goodwill				$ 8,700
CVM
Business Acquisition [Line Items]
Percentage of voting interest acquired												100.00%
Goodwill												$ 8,959
Acquisition related costs								$ 0	600	100
Goodwill, period increase (decrease)									$ 110
Revenue of acquiree since acquisition date						800
Earnings or loss of acquiree since acquisition date						$ 100
Revenue, net										130,434
Net loss attributable to Heska Corporation										$ (788)