EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Sep. 17, 2019
Earnings Per Share [Abstract]
Net (loss) income attributable to Heska Corporation	$ (5,288)	$ 814
Basic weighted-average common shares outstanding (in shares)	7,568	7,459
Assumed exercise of dilutive stock options and restricted shares	0	506
Diluted weighted-average common shares outstanding	7,568	7,965
Basic (loss) earnings per share attributable to Heska Corporation (in dollars per share)	$ (0.70)	$ 0.11
Diluted (loss) earnings per share attributable to Heska Corporation (in dollars per share)	$ (0.70)	$ 0.10
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted units excluded from computation of earnings per share	1,687	86
Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted units excluded from computation of earnings per share	1,509	0
Senior Convertible Note
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted units excluded from computation of earnings per share	43	0
Stock Options And Restricted Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted units excluded from computation of earnings per share	135	86
Senior Convertible Note \| Convertible Debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (in dollars per share)			$ 86.63

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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