EARNINGS PER SHARE (Details) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2010	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares
Earnings Per Share [Abstract]
Reverse stock split conversion ratio	0.10
Net (loss) income attributable to Heska Corporation | $		$ (1,670)	$ 3,083	$ 2,383	$ 11,023
Basic weighted-average common shares outstanding (in shares)		7,289	7,139	7,194	6,985
Assumed exercise of dilutive stock options and restricted shares		0	529	626	595
Diluted weighted-average common shares outstanding		7,289	7,668	7,820	7,580
Basic (loss) earnings per share attributable to Heska (in dollars per share) | $ / shares		$ (0.23)	$ 0.43	$ 0.33	$ 1.58
Diluted (loss) earnings per share attributable to Heska (in dollars per share) | $ / shares		$ (0.23)	$ 0.40	$ 0.30	$ 1.45
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		675	27	190	132