CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Previously Reported	Traditional Common Stock	Traditional Common Stock Previously Reported	Additional Paid-in Capital	Additional Paid-in Capital Previously Reported	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Previously Reported	Accumulated Deficit	Accumulated Deficit Previously Reported
Beginning balance at Dec. 31, 2016	$ 86,975		$ 70		$ 238,635		$ 97		$ (151,827)
Beginning balance (in shares) at Dec. 31, 2016			7,026
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	10,525								10,525
Issuance of common stock, net of shares withheld for employee taxes	1,427		$ 2		1,425
Issuance of common stock, net of shares withheld for employee taxes (in shares)			218
Stock-based compensation	2,093				2,093
Accretion of non-controlling interest	845				845
Distribution for Heska Imaging minority interest	(963)								(963)
Other comprehensive income (loss)	125						125
Ending balance at Sep. 30, 2017	101,027		$ 72		242,998		222		(142,265)
Ending balance (in shares) at Sep. 30, 2017			7,244
Beginning balance at Jun. 30, 2017	96,575		$ 72		241,575		267		(145,339)
Beginning balance (in shares) at Jun. 30, 2017			7,196
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	3,083
Ending balance at Sep. 30, 2017	101,027		$ 72		242,998		222		(142,265)
Ending balance (in shares) at Sep. 30, 2017			7,244
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of accounting standards	2,634								2,634
Beginning balance at Dec. 31, 2017	103,074	$ 100,440	$ 73	$ 73	243,598	$ 243,598	232	$ 232	(140,829)	$ (143,463)
Beginning balance (in shares) at Dec. 31, 2017			7,303	7,303
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	2,383								2,383
Issuance of common stock, net of shares withheld for employee taxes	2,386		$ 3		2,383
Issuance of common stock, net of shares withheld for employee taxes (in shares)			250
Stock-based compensation	3,774				3,774
Other comprehensive income (loss)	(16)						(16)
Ending balance at Sep. 30, 2018	111,601		$ 76		249,755		216		(138,446)
Ending balance (in shares) at Sep. 30, 2018			7,553
Beginning balance at Jun. 30, 2018	109,922		$ 75		246,422		201		(136,776)
Beginning balance (in shares) at Jun. 30, 2018			7,498
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(1,670)								(1,670)
Issuance of common stock, net of shares withheld for employee taxes	1,928		$ 1		1,927
Issuance of common stock, net of shares withheld for employee taxes (in shares)			55
Stock-based compensation	1,406				1,406
Other comprehensive income (loss)	15						15
Ending balance at Sep. 30, 2018	$ 111,601		$ 76		$ 249,755		$ 216		$ (138,446)
Ending balance (in shares) at Sep. 30, 2018			7,553