EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 14, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 17, 2019
Earnings Per Share [Abstract]
Net (loss) income attributable to Heska Corporation		$ (6,357)	$ (241)	$ (11,645)	$ 573
Basic weighted-average common shares outstanding (in shares)		8,776,000	7,486,000	8,165,000	7,463,000
Assumed exercise of dilutive stock options and restricted shares		0	0	0	493,000
Diluted weighted-average common shares outstanding		8,776,000	7,486,000	8,165,000	7,956,000
Basic (loss) earnings per share attributable to Heska Corporation (in dollars per share)		$ (0.72)	$ (0.03)	$ (1.43)	$ 0.08
Diluted (loss) earnings per share attributable to Heska Corporation (in dollars per share)		$ (0.72)	$ (0.03)	$ (1.43)	$ 0.07
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and restricted units excluded from computation of earnings per share		687,000	714,000	1,240,000	225,000
Series X Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion of convertible securities (in shares)	122,000
Traditional Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion of convertible securities (in shares)	1,508,964
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		332,000	0	920,000	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		0	0	21,000	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		355,000	714,000	299,000	225,000
Senior Convertible Note | Convertible Debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (in dollars per share)						$ 86.63