CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Traditional Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018		0	7,676,000
Beginning balance at Dec. 31, 2018	$ 122,409	$ 0	$ 77	$ 257,034	$ 277	$ (134,979)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Heska Corporation	814					814
Issuance of common stock, net of shares withheld for employee taxes (in shares)			71,000
Issuance of common stock, net of shares withheld for employee taxes	(3,070)		$ 0	(3,070)
Stock-based compensation	1,186			1,186
Other comprehensive income (loss)	(62)				(62)
Ending balance at Mar. 31, 2019	121,277	$ 0	$ 77	255,150	215	(134,165)
Ending balance (in shares) at Mar. 31, 2019		0	7,747,000
Beginning balance (in shares) at Dec. 31, 2019		0	7,882,000
Beginning balance at Dec. 31, 2019	154,364	$ 0	$ 79	290,216	513	(136,444)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to Heska Corporation	(5,288)					(5,288)
Issuance of common stock, net of shares withheld for employee taxes (in shares)			(39,000)
Issuance of common stock, net of shares withheld for employee taxes	(202)		$ (1)	(201)
Issuance of preferred stock, net of issuance costs (in shares)		122,000
Issuance of preferred stock, net of issuance costs	121,785	$ 1		121,784
Stock-based compensation	353			353
Other comprehensive income (loss)	(356)				(356)
Ending balance at Mar. 31, 2020	$ 270,638	$ 1	$ 78	$ 412,152	$ 157	$ (141,750)
Ending balance (in shares) at Mar. 31, 2020		122,000	7,843,000