INCOME TAXES - EFFECTIVE INCOME TAX RECONCILIATION (Details)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal tax rate	34.00%	34.00%	34.00%
State income taxes, net of federal benefit	(5.00%)	2.00%	3.00%
Non-controlling interest in Heska Imaging US, LLC	1.00%	(3.00%)	(1.00%)
Non-temporary stock option benefit	(30.00%)	(7.00%)	(1.00%)
Other permanent differences	1.00%	(1.00%)	0.00%
Change in tax rate	32.00%	0.00%	(1.00%)
Change in valuation allowance	16.00%	0.00%	(14.00%)
Other	0.00%	1.00%	15.00%
Effective income tax rate	49.00%	26.00%	35.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

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-Publisher FASB
-Name Accounting Standards Codification
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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